Originally Posted by bpeckm
I say "Aha!" to your comment that, in spite of it being more difficult to begin with, having the BLOCK milled will give you further options down the road....
That makes good sense and you've had the good fortune to find a guy willing to do the machining for a very reasonable sum. Hard to beat that.
I went the other route and turned a few sets of Nikasil barrels (800 and 1000cc) to suit /5 blocks. I built a fairly simple lathe fixture with facility to securely attach the cylinder using the two cylinder to head studs. Worked well and helped me achieve one of the critical steps in modernising an old R75/5.