samolot,
I've never used clamps on any plane I've built and I've built dozens. I'm sure they would come in handy in some applications but I've never had to stop building to go buy clamps. I certanly don't see you needeing them building the menace. Bags of rice make nice weights along with a few 5-10 lb weight lifing plates. Good T pins and blue masking tape are also valuable tools when building.

You can make an excellent, cheap, flat building board out of sheetrock. Cut it to size, then tape the edges to keep the plaster from getting all over the place. Put it on a flat surface and build away. It's just as good as the "comercial " building boards.

rrragman