In China they've probably screen-grabbed this to produce a laser-guided jig already, but here I've gone for a tried-and-trusted method to suit every doomsday prepper.
(Ed. anticipating a meltdown on the stroke of 00/01/01/ Colin stashed a 'doomsday pack' in his loft: it consisted of baked beans, real ales and Christmas puddings.)
I clamped the back end to stop the lats from lifting prior adhesive baking overnight. Pinch them together and draw a template on the blocks, with which to drive in nails to hold in place.
Transfer the outline to the hub, which you will have 3D-printed while I scout around for an off-cut plank. Drive a pair of screws in from either side, to fix firmly in place.
This one's not a perfect triangle nor is it set square, but if the prow lines up broadly with the keel then it should all come out in the wash... as I used to say at Airbus.
