So having tried in vain to get my own design of sliding dropout manufactured I turned instead to the splendid chaps at Paragon Machine Works in Richmond, CA.
The drop-outs arrived on Tuesday and I couldn't resist getting the stainless steel bits super-finished - check out the pics below....
Left Hand Drop-Out::
Riight Hand Drop-Out::
So as you can see all of the bits are really nicely made, now all I need to do is jig them up ready to be joined to the rear triangle.
Check out paragon machine works for these and more splendid bike frame building supplies -