Zulubilly is correct....I have Leslie West's old prototype that has a front panel big name of "Coliseum Model T" (looks like a handwritten one-off silkscreen Sunn did) and it is built on a larger 2000S/1200S chasis/box and has roughly the control layout of the later Model T. The guts and tranny/tube layout shows a number of moved parts from various ideas/versions that must have been tried out by Sunn/West.
I got it with his matching Sunn 4x12 cab.
Yeah, yeah....I know...post pics when I can
BTW...someone recently sold a very early production Model T on EBAY and on the rear chasis in small letters it actually read "Coliseum Model T." Only one I've seen like that.
Maybe Sunn was going to call it that but then split the name for the two different Model T and Coliseum models instead?
Conrad?