Templating
Using a ghetto compas (2 paint sticks duct taped together) I made the general circle for the shield on a template on printer paper.
Fixing
I decided the outside rim was too thick, so I made it thinner, I also don't like seeing my mistakes, so I covered over my lines in white paint. :P
Detailing Pattern
I drew where I wanted the planks to be as well as for the metal part in the middle and the circle.
Straps
Created arm straps out of 4mm foam(ish).
{"items":["e88b01a7-ac8a-4697-8845-1a756ebe12dd","ec529bc6-adc0-46bf-a3b3-9c1f112af6e8","0f3347c6-1e5f-443e-bed8-99072b5577eb","1352119f-875d-42f1-baf9-778127279c38"],"styles":{"galleryType":"Strips","groupSize":1,"showArrows":true,"cubeImages":true,"cubeType":"fill","cubeRatio":"100%/100%","isVertical":false,"gallerySize":550,"collageAmount":0.8,"collageDensity":1,"groupTypes":"1","oneRow":true,"imageMargin":0,"galleryMargin":0,"floatingImages":0,"chooseBestGroup":true,"smartCrop":false,"hasThumbnails":false,"enableScroll":true,"isGrid":false,"isSlider":false,"isColumns":false,"isSlideshow":true,"cropOnlyFill":false,"fixedColumns":1,"enableInfiniteScroll":true,"isRTL":false,"minItemSize":120,"rotatingGroupTypes":"","rotatingCubeRatio":"","gallerySliderImageRatio":1.7777777777777777,"numberOfImagesPerRow":3,"numberOfImagesPerCol":1,"groupsPerStrip":0,"borderRadius":0,"boxShadow":0,"gridStyle":0,"mobilePanorama":false,"placeGroupsLtr":false,"viewMode":"preview","thumbnailSpacings":5,"galleryThumbnailsAlignment":"bottom","isMasonry":false,"isAutoSlideshow":false,"slideshowLoop":false,"autoSlideshowInterval":4,"bottomInfoHeight":0,"titlePlacement":"SHOW_ON_HOVER","galleryTextAlign":"left","scrollSnap":true,"itemClick":"expand","fullscreen":true,"videoPlay":"hover","scrollAnimation":"NO_EFFECT","scrollDirection":1,"overlayAnimation":"NO_EFFECT","arrowsPosition":0,"arrowsSize":23,"watermarkOpacity":40,"watermarkSize":40,"useWatermark":true,"watermarkDock":{"top":"auto","left":"auto","right":0,"bottom":0,"transform":"translate3d(0,0,0)"},"loadMoreAmount":"all","defaultShowInfoExpand":1,"allowLinkExpand":true,"expandInfoPosition":0,"allowFullscreenExpand":true,"fullscreenLoop":false,"galleryAlignExpand":"left","addToCartBorderWidth":1,"addToCartButtonText":"","slideshowInfoSize":200,"playButtonForAutoSlideShow":false,"allowSlideshowCounter":false,"hoveringBehaviour":"NEVER_SHOW","thumbnailSize":120,"magicLayoutSeed":1,"imageHoverAnimation":"NO_EFFECT","calculateTextBoxWidthMode":"PERCENT","textBoxHeight":0,"textBoxWidth":200,"textBoxWidthPercent":50,"textImageSpace":10,"textBoxBorderRadius":0,"textBoxBorderWidth":0,"loadMoreButtonText":"Load More","loadMoreButtonBorderWidth":1,"loadMoreButtonBorderRadius":0,"imageInfoType":"NO_BACKGROUND","itemBorderWidth":0,"itemBorderRadius":0,"itemEnableShadow":false,"itemShadowBlur":20,"itemShadowDirection":135,"itemShadowSize":10,"imageLoadingMode":"BLUR","expandAnimation":"NO_EFFECT","imageQuality":90,"usmToggle":false,"usm_a":0,"usm_r":0,"usm_t":0,"videoSound":false,"videoSpeed":1,"videoLoop":true,"gotStyleParams":true,"selectedLayout":"5|bottom|1|fill|false|1|true","allowSocial":false,"allowDownload":false,"allowTitle":true,"allowDescription":true,"loveButton":false,"loveCounter":false,"showVideoPlayButton":true,"galleryImageRatio":2,"sharpParams":{"quality":90,"usm":{}},"galleryHorizontalAlign":"flex-start","galleryVerticalAlign":"center","imageLoadingWithColorMode":"PICKED_COLOR","imageRatioType":"FIXED","numberOfDisplayedItems":3,"itemShadowOpacityAndColor":{"themeName":"color_15","value":"rgba(0,0,0,0.2)"},"textBoxBorderColor":"color-5","titleDescriptionSpace":6,"textsVerticalPadding":0,"textsHorizontalPadding":0,"textBoxFillColor":"color-2","alwaysShowHover":false,"isStoreGallery":false,"previewHover":false,"calculateTextBoxHeightMode":"MANUAL","galleryLayout":5,"useCustomButton":false,"customButtonText":"","itemOpacity":{"themeName":"color_15","value":"rgba(0,0,0,0.6)"},"itemFont":{"style":{"bold":false,"italic":false,"underline":false},"family":"avenir-lt-w01_85-heavy1475544","preset":"Custom","editorKey":"font_5","size":40,"fontStyleParam":true,"value":"font:normal normal normal 40px/50px avenir-lt-w01_85-heavy1475544,sans-serif;"},"itemFontSlideshow":{"family":"avenir-lt-w01_85-heavy1475544","displayName":"Basic Heading","style":{"bold":false,"italic":false,"underline":false},"size":22,"preset":"Custom","editorKey":"font_5","fontStyleParam":true,"value":"font:normal normal normal 22px/27px avenir-lt-w01_85-heavy1475544,sans-serif;"},"itemDescriptionFontSlideshow":{"family":"avenir-lt-w01_35-light1475496","displayName":"Paragraph 2","style":{"bold":false,"italic":false,"underline":false},"size":15,"preset":"Custom","editorKey":"font_8","fontStyleParam":true,"value":"font:normal normal normal 15px/18px avenir-lt-w01_35-light1475496,sans-serif;"},"itemDescriptionFont":{"family":"avenir-lt-w01_35-light1475496","displayName":"Paragraph 2","style":{"bold":false,"italic":false,"underline":false},"size":15,"preset":"Custom","editorKey":"font_8","fontStyleParam":true,"value":"font:normal normal normal 15px/18px avenir-lt-w01_35-light1475496,sans-serif;"},"itemFontColor":{"themeName":"color_11","value":"rgba(255,255,255,1)"},"itemFontColorSlideshow":{"themeName":"color_15","value":"rgba(0,0,0,1)"},"itemDescriptionFontColor":{"themeName":"color_11","value":"rgba(255,255,255,1)"},"itemDescriptionFontColorSlideshow":{"themeName":"color_15","value":"rgba(0,0,0,1)"},"loadMoreButtonFont":{"family":"open sans","displayName":"Paragraph 2","style":{"bold":false,"italic":false,"underline":false},"size":13,"preset":"Body-M","editorKey":"font_8","fontStyleParam":true,"value":"font:normal normal normal 13px/1.4em \"open sans\",sans-serif;"},"loadMoreButtonFontColor":{"themeName":"color_15","value":"rgba(0,0,0,1)"},"loadMoreButtonColor":{"themeName":"color_11","value":"rgba(255,255,255,1)"},"loadMoreButtonBorderColor":{"themeName":"color_15","value":"rgba(0,0,0,1)"},"arrowsColor":{"themeName":"color_11","value":"rgba(255,255,255,1)"},"oneColorAnimationColor":{"themeName":"color_11","value":"rgba(255,255,255,1)"},"responsive":false,"isAccessible":false,"allowLeanGallery":false,"layoutsVersion":2,"selectedLayoutV2":5,"isSlideshowFont":true,"externalInfoHeight":0,"externalInfoWidth":0},"container":{"top":"","bottom":"","left":"","right":"","width":980,"height":660,"position":"","avoidGallerySelfMeasure":true,"galleryWidth":980,"galleryHeight":460,"scrollBase":0}}