Local builders sell foam insulation sheets / blocks. We have hot-wire cuttters .... best scratchbuilders on the planet in Wattflyer - likes of Chellie, Quorneng etc. etc. (sorry if I missed your name - you're all great !)
So how simple can it be ?
I have a 1m square sheet of 2" thick styrene .... Now I reckon a slice of that for a fuselage spine. Say 2 x 2 .... a slot through it for a delta 6mm wing sheet.
Slot in top for 6mm Fin and extension running forward.
Simple front mounted ply motor plate and bell motor.
Prop saver + prop
Cheap old small LiPo
Gash bin ESC
4ch radio doing throttle and elevons.
So that's say ... 25" long, 20" wide, 2" sq. fuselage .....
Any one like to compete ?
Chellies foamboard job got me thinking ...