okay, so you built this thing from 1/4 inch plastic that you got at some vendor correct?
have you ever thought of making all the panels from 1/8 luan plywood? ive helped build 1/4 scale aircraft bilt from luan ply and its strong as nails.
next time you build one it may help keep the weight down.
all in all, i admire the ingenuity you have there.
1/8 " plastic......but...yea, there is a vendor close by. I have made a boat from 1/4'' baltic birch 5 ply for the ribs and stringers and 1/8 " 5 ply baltic birch for the skin...... [link=http://www.rcuniverse.com/forum/m_3964321/mpage_1/key_inch/tm.htm]50 Inch[/link] ......but the first time I took it out in the road, a rock punched a hole in the bottom.
I like building with the plastic because...I can run this thing over concrete, gravel, rocks....pretty much anything, without heavy damage. when the bottom gets too scratched up, I just lightly sand and run a rag soaked in MEK over the bottom to shine it back up.