Rear heat duct is most embarrasingly better than the front...
Mounted it on the same block I used for the front, with spacer.
Started to layup the BID, then remembered the UNI reinforcement goes on first, stripped it off.
Did the UNI a bit differently to last time, wet out the cloth on the cutting board with peel ply underneath, then cut off 2" strips with the lecky scissors and transported on the peel ply.
BID was stil usable.
Needed a fixed start for the transition piece, so fixed one end along the long side with masking tape, which will stay in the piece. Then wrapped it around, wetting out as I went. Cut it square on the second time round, the edge held with peel ply.