RE: TdL Systems Extra 330L
I did like the plane. It flew very well and is a nice size plane. It also was an excellent value at $125 delivered to my door.
I used nylon bolts to mount landing gear on a plane, and they are tough. I think you will tear gear out before breaking 1/4-20 nylon bolts.
I don't have the manual for this plane and have forgotten the CG.
Post some pictures when you get time.