Besides, I think it would be wrong to try to make an episode reconstruction so realistic that it could be mistaken for the real thing. It should be clear that it isn't the real thing, that it's an approximation of something that was lost. It should look like animation.
Indeed. The Invasion recreations are fine, but they don't show what Troughton was actually doing with his face, and when missing episodes have turned up he's often been pulling expressions you didn't expect from the soundtrack, or pulling off some unexpected bit of business. Similarly, the recovered Galaxy 4 episode includes lots of cranes shots and other directorial touches that nobody would have thought to put into a reconstruction (unless, perhaps, they're detailed in the director's camera scripts).
The reconstruction shouldn't pretend to be the originals, just enjoyable substitutes.