well some people would say use 1/8 inch thick tubing but i've seen 1/16 used alot with no problems. seems to hold up just fine.

axle plate's, 3/8 will be fine.

I was born with nothing and still have most of it.
i bought it, i don't ride it, hardcore internet biker!
MI. E.S.F.H. it's how we roll
Erditurdi says,"JYJ - Your contribution to this thread is outstanding as usual, thank you"
 The entire world is all about HOW MUCH MONEY YOU HAVE and WHO YOU KNOW.  I don't have a lot of money but I have a hell of a lot of heart and soul that can't be purchased.