all of the tubing is 1/8 inch thick even the rear triangle. I would guess the frame itself weighs about 20lbs currently and it isn't even finished. I really wanted this to be a machine to feel very solid. Since I started with a bicycle frame for my last build the tubing was very thin and it feels slightly fragile to me. I know it's not, but with this build and the speeds I will be seeing I would just like to have piece of mind when I am going down the road.
As for the width. They measure it with all the shrouds and doodads on it, and i plan to strip it down and trim the fan blades on the flywheel. So I figure I can drop about 3 inches off of the factory measurements. It will still be a very wide engine but the lowness of the bike and the width of the tank, seat, fork, and frame should hide it fairly well. just to give you an idea the current width the rear triangle it 6 5/8 wide.
On a side note I just fond out that the Coker Simplex tires I plan on using have a P rating which means they are good for up to 92mph. This bike is gonna be so much fun when I get it done I cant wait.