The swingarm of a Softail type frame adds considerable weight to a custom bike. Eliminating a lot of the pivot material, crossbar, shocks, and heavy fender braces reduces a lot of weight and quickly adds some performance and style for a very classic looking chopper that uses later parts.
The frame is made from 1-1/4 x .125 DOM tubing. The neck is heavy wall 2 DOM tubing with counter bores for press-in chrome or stainless neck bearing cups. The backbone is straight for that classic high neck chopper look (but still makes for a pretty low bike). The neck is raked to 35 degrees. The seat post is leaned back to allow exceptional clearance for the rear cylinder and exhaust without dimpling the tube. The bottom rails and top rear wishbones are widened out. The frame takes a stock tire without looking strange but has 10-1/2 between the axle plates so stock axles still fit but a much wider tire will fit.
The frame is completely TIG welded. Welds on the neck and axle plates have been smoothed down (only the ripples of the TIG welds have been cleaned off without removing much weld bead). The frame was washed down with metal prep to remove the dark oxide coat on the DOM steel tube.
Here is a view of the rear wishbones. The typical softail has a kick-out on the left side to leave room for the 1.5 belt drive. This frame has been made symmetrical by adding a kick-out to the right side. Since the frame and swingarm stanchions are eliminated, there is a lot of extra room for a wider tire and still use the long lasting belt drive or with a chain, maybe a little more rubber can be squeezed in.
Below is a picture of the frame mocked up with a plastic mock engine and stock softail transmission, 16 rear tire, 21 front wheel and some drag bars. The front end is a mock item made to be adjustable for different fork length and tree rakes. A stock oil tank will not fit anymore but there is plenty of room for everything else.