Just to prove someone's playing along at home, here's my Sonny 1500 from the RCM&E plan.
The first time I've cut or glued balsa for about 25 years, so I took the easy option and ordered the kit from RBC Kits.
Glue's come on a bit since I last did this (as well as CNC cutting...) so this was all fairly straightforward.
And eventually I ended up with this:
Thanks Ton!