Not a problem at all Deacon. I can't recall exactly what size everything is off hand (since I used different material on certain parts) but I'll be happy to check tomorrow when I get off work.
I do know that the lower mounts are 1/2" OD tubing, same as the straight section of the upper mount. The wall thickness is what I'm uncertain of though. The only solid steel rod is on the upper fairing mount, between the straight tube and the backbone of the frame - and it's 3/8" OD. The stock GSXR mounts around the headlight......I have no idea what size the tubing is.
And I have to say, everything does feel really solid. Not enough to handle a slide of course, but I can't imagine anything bending due to wind pressure.