RE: necessary tools for scratch building ...
RCU member Cafeenman has an excellent site dedicated to building our wonderful planes. His site is full of some great building tips, but also covers what a lot of the tools needed are. It's well worth the time to spend reading up on his site. I learn something new everytime I look at his site.
You can find it at:
[link]http://www.airfieldmodels.com/index.htm[/link]