Using acetone to remove the paint tended to leave the plastic a bit lumpy, but my polishing wheel tends to leave a dull surface, so I went back and forth a bit and then used a glaze paint to smooth things out. The USB rifle still works as a flashdrive, I used one of those M-Gear connectors from a few years ago as the grip/hardpoints.
Unfortunately, there's a rubbing point on the back of the head, so the paint got stripped a little during transformation. It wasn't a place that needed paint, though, so it looks okay with the patch gone.
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Here's the pictures I referenced, just links so as not to clog up your page:
http://grantpilkay.com/BBRM.JPG
http://grantpilkay.com/BBVM.JPG
You can see what I mean, I didn't change Bumblebee himself at all, though I did manage to make his gun fit in the cab. Looks sort of anemic, though. Yours is better.