Thanks for the interest, friends
@ Bernie - thanks for the link and what a nice plane! I noted that you made some improvements to the kit. I'll show the "basic" version...
The front fuselage side panels are plainly flat. However, they take quite a few parts inside. They will serve both to add strength and to ease the cross formers adjustment. Not really necessary, if you ask me, but the model would not be better without them.
I decided to superimpose the parts to glue on card to the laser cut parts. This way, the thickness is the same but, with the laser cut parts, maybe the others could be discarded.