Not sure whether you're sorted yet or not but....
I have a pretty tidy black Mk 1 DMR Trailstar hanging on my shed wall - I'd say it's had a very easy life by the looks of things. Stickers are getting a bit fragile but these are easily replaced. Bottom bracket threads are perfect and the frame is straight. It's got horizontal dropouts but the chain tugs have a mech hanger. The frame also has disc and canti mounts. It probably sizes up like a 16/17" frame but I can measure the top tube and head tube if you like...
Would go very nicely with those Z1's up front.
I'm looking for £50 posted including a DMR seatpost, early DMR chain tugs, and a nice chunky no-name seat clamp.
I have almost a bike work of bits kicking around if you're interested...
Cheers,
Mark