OK Here's my progress so far.
The diff wasn't too bad and just needed a good clean. The rest of the gearbox parts looked almost new so that was a nice surprise. Outdrives don't have much wear either, and most of the bearings look like new. I don't think this car has seen loads of use.
Shocks have been cleaned and rebuilt with new oil. One shock had a seal broken so will need to find a losi cartridge rebuild kit.
I've given all the removed parts a good clean and ready to reassemble them.
At the moment my primary goal is making the buggy run like new. I will worry more about the appearance etc. once it does.
