Well its on its way at least. I managed to get a 300mm F4.5 Tessar of of Ebay for about $58. It should cover 4x5 with no problem and no fall off even when wide open (or close too it).
Next step will be convert a few film holders to vacuum backs.
-------------------- Zach Kessin
Yesha Israel
Meade ETX 127 Mak-Cass
15x70 Celestron Skymaster Binoculars
Sinar F 4x5 view camera
Rolliflex Camera 80mm F2.8
Pentax K-1000 Camera 35,50 and 60--300mm zoom
3 kids, Large cat, small dog
Cool, that seems like a great price. Hopefully a decent mount will become available so you can get started. The CG-4 and CG-5 mounts with drives would probably do an adequate job for that focal length. Here in the states you can get them used for a good price. There was a CG-5 with RA drive that just sold here in Shop & Swap for $125. Unfortunately the shipping to Israel would run about $150.
I'm also considering large format so it will be interesting to see how things progress for you.