Wing B25 or Royal Staggerwing. Both were very hard. Too much planking on the engine nacelles and fuse on the B25. Too much wood carving and sanding around the wings of the Staggerwing. Took me a year on the B25 and a couple of months on the Staggerwing. I've built over 250 planes in 40+ years doing it (started when I was 7 with Comet kits). These two stand out the most. The B25 has never been flow, pic was taken before decals, props and shaft extensions where done. Notice all of the filler behind the cowl and in the wing fillet. Never took any pics of the Staggerwing with covering as owner had me do it in cream. Hated it.

George