A few weeks ago, I asked forum members if it was possible to mount a barrel 35" Red Dot Artar into a Copal 3 shutter. It turns out that it was and I just today got the finished result back from KHB Photografix. I posted a couple of quick photos as a final post near the end of the original thread:
but have a much better quality photo to show you below:
So, it can be done and the result is not an overwhelmingly huge lens. There are more comments and specs in my post in the thread cited above. Thanks all!