Realised my straight cut templates from CH10 would not work here because of the angles involved. They are made from 10mm MDF and have the wrong size nail holes in them. Made a new set from 4mm ply, and numbered the holes, mirror fashion.
Had a bugger of a time figgering out where exactly on the blocks to put the ribs then just put up the biggest (inboard) inside the block's edge. Was surprised the outboard rib was off the top of the block. Ah! Dihedral! Readjusted everything, dropped the rear block down to 10mm from the bench and stuck everything together with sticks, and 5-min epoxy with flox in, held together with table top clamps. Propped everything up on 2 x 4" scrap for the edge cuts
Made both edge cuts with the trusty hotwire saw, having first re-jigged it to remove the extra bit I put in to cut the canard cores.