I've seen quite a few steel ones on EBay. I bet if you look at the pics there, you'll be able to design and build your own. I don't have any pics from mine to share, but all I did was build a sturdy wooden,yes wood, cradle with triangle out riders,(for lack of a better descriptive word,) and attached a radiator in a frame and set a battery and portable gas tank on the garage floor. I made a small panel that held a tach, water temp and oil pressure,wired it all up and let her rip. No dyno obviously, but was just fine for cam break in and tuning.Didn't have muffler either, but I have good, understanding motor head neighbors.
