A little more fabrication...
Pic 1- I tacked the steering tube onto the frame after I cleaned everything up a little with a flap disk sander...there was too much old paint on the material, getting into the welds. The wheelbase is 51", a fairly long bike.
If you're building a frame without a jig, as I am, I just run a long dowel down through the steering tube as the frame is sitting on a centering line drawn on the table.
Pic 2- I don't think the frame is that interesting, so I don't want to draw attention to it, but in keeping with the Satin Black and Fly Yellow color scheme, I decided to go with the yellow on the wheels and engine, and hide the frame in satin black.
Pic 3- I bought some aluminum paint canisters at Harbor Freight to fab a gas tank. I cut the necks off, butted them together in a bar clamp mounted in the bench vise, pre-heated the aluminum with a propane torch, then used an oxy/acetylene #1 tip with a neutral flame, and Forney fluxing general purpose aluminum rod to weld the two canisters together. The fittings are aluminum tubing welded to the tank, and threaded to accept brass fittings.
Pic 4- I left enough of the neck on the two canisters when I trimmed the tops off to form a small 'waist' in the center of the tank...this allows a hand-bent heavy brass band to lay flush inside the 'waist-band'. This thick brass band will be used to mount the tank to the frame after I fab a large steel bung that will be welded to the frame, and the band will be screw-clamped through the bung. The tank holds a half gallon...four lbs of fuel when full.