Glad you appreciated it. And when I saw your name I apparently completely forgot you had a question.. So here's my 2 cents:
If you didn't already, next time you order parts I'd get a few extra dogbones and axles. If you can find someplace cheap, I'd pick up a bunch of different sized screws (either in a kit or just a whole bunch of Redcat's packs). I also like to keep a differential housing or 3 around because I like to run in to mailboxes.
As far as preventative maintenance on the car, I wouldn't really bother with anything until it comes up except periodically tightening screws and checking the gear mesh. I think I crash more than most people but I'm working on my cars so much that pretty much every part is going to be removed every 5th time or so I drive it.
And now you've got me thinking.. I've been planning on converting my extra Backdraft to, 1/6 scale, but I think converting it to a Caldera would make more sense.