Ian,
I once promised myself never to sell any Voigtlander lenses, but I have a good (see test result below) 1930 Skopar in dial set Compur 1 shutter that I sit with in my cave and call my Precious - Time to give that up
The Skopar is oddly a better lens than the Heliar, I have two Heliars and know it to be a problematic design in some respects - However it is this very feature, I think residual spherical aberration, that makes them such a versatile and desired lens - Mine are not for sale and at 36cm and 240mm not suitable for your reconstruction
Not free, I would part with the Skopar for Au$128 + postage - Any less and I would prefer to keep it
There is a 135mm Schneider Radionar in shutter for $35.00 plus postage in Denmark, I will go through my PMs and let you have the seller's contact - I bought a spare Sinar rail from him, it, the deal and the packing were all perfect - I have to send that as a separate post as I have typed too much here to loose - Back in a few minutes
John