RE: q 40
Matney models offers a couple of Q40 kits. YOu get a fuse and foam cores for about $125 i think.
I am building a Matney models "Napier" Q-40 short kit. The kit is $125 and you should be able to finish it up for less than half price of one of the composite models currently being sold.
This one was my first Q-40 and it is going together fine. I am taking pictures of construction and should complete the model in a few weeks.