To make your own frame like the original in steel is easy. All you do is cut lengths of 1/4 thicK wall tube and weld 1/4 caps on one end. Then drill the hole for the bolt. Make them 3 inches long ,you can cut them off later. After you have all of the pieces bolted on the engine then just connect with steel tubing !/8 wall DOM 1.25 diameter. Tig weld after it is all tacked. Make sure the fit up is tight. Otherwise if it loose and you weld it it will shrink and could put a lot of strain on the engine castings. Make the tubes tap into place. Very important. IMPORTANT: AFTER the frame is tacked and fully welded go back and re drill all the holes in the mounts about 1/16 larger and make sure you can put all the bolts in the engine and frame without tapping. You can buy a HD steering head from Bitter End choppers . Get the fat one. Then you can use any H-D style front forks you want. Or springer or telescopic forks.