finally I was happy with CAD drawings of the frame, so I started cutting and welding.
I drew the full scale layout on the surface of the welding table and tacked the frame. Then flipped it over to tack some more.
Here's both arches side by side after tacking
I added the forward extensions. I'm leaving the rear portion for later, after the frame is welded together.
It's way off in the next to pictures, but I had to drop it in place to see what it would look like.
I did not make any cross members yet. I'm not sure where I want them.