Well, I can report a little progress with the 6mm moderns prep. 44 M113s done, and now 24 M60A3s. Still quite a few more vehicles to do, but a start is a start!
This picture shows the current state of the tank park. The miniatures, incidentally, are by Heroics and Ros.
These M60s were very easy to prepare, with no nasty flash to speak of. The M113s were generally OK, but each one had a hunk of excess metal that needed to be cut and then filed off the back, so they quite a lot more work.