I make these seats for a bosuns chair: 6mm hoop pine ply with 12mm PET felt for a bit of comfort, size varies, these are 460mm x 110mm, weight 310g. 4 holes for 6 to 8mm cord, best to tie it crossing diagonally under the seat to give a bit of movement - got this from actual bosuns chair, then knot all 4 stands at the top to clip in to. Will be experimenting to see if I can connect it to the main tie-in point on my harness.
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