Donohue 559 low-trail conversion

Sure, you can look at it like that, although I fail to see the resemblance to Thorn specifically. The geometry isn't really something you can readily find in OTP frames. I've thought of this a bit like an Elephant NFE on a budget, and now there's the Rawland Ravn that's available for pre-order.

Edit. ...unless #gotcha

Or you could have bought a thorn ...

Thorn don't do low trail geometry.