Hey guys,
I want to try a Spad and found the design I want to build. Its the Gremloid that I found here, http://www.svensons.com/airplanes , but I cant find 2.5 square gutter pipe anywhere. Could I use the 2x3 pipe that home depot sells, or is there a source for 2.5 in all the plans.

Another question - should the flutes of the coro go width-wise on this plane and should I re-enforce it with something?

Thanks