Square Tubing Size

[redidbull]

I kind of like this frame. I'm thinking of building it into a motorized version with the 6.5 predator I have. Figure I can move the seats forward enough to have room for the motor. Was trying to figure what size tube that is. I have some 1.5" but thinking that may be bigger. Any thoughts? Thanks. Jim

 

[Old Iron]

Looks like 2x2 to me.
Definitely want as thin of a wall as possible to keep down the weight.

 

[redidbull]

Place I get most of my tubing from is by the pound, so thin it will be. Thanks. Jim