Pete, My B44 has literally only had one corner worked on since I got it (Dave did have a small part to play in that!)...and even then it was really just a wishbone and shock top...not sure that counts as rebuilt...just running repair.
The X6 has admittedly had a little more attention...Talywain in the rain made sure of that, but I only rebuilt the gearbox after that outing.
I have repaired 2 broken chassis episodes on the X6 as well, but literally only the chassis got changed over on both occasions...funny though, I'm sure Dave was involved in one of those moments as well!!!
Oh and I've seen balders break his Tamiya on a few occasions now...it's all that metal...it's shiny, but it does a great job of breaking the plastic bits instead!