I had a spare Ironhide and I'd seen this done elsewhere, so I thought I'd quickly give it a crack.
I was tempted to start with a red Enforcer Ironhide but instead I gave him this scratchy kinda dirty finish, for a bit more personality. My final lacquer was dirty too, you can see it in the original black areas.



He transforms nicely, I left lots of unpainted room around the rear wheel to evoke the tank-treads look.



Then I though, what about a microscope mode? Maybe a compound microscope? I guess this is as good as it gets.



And here he is, hanging out with my other Ironhide (whom I have added a few paint highlights).