It arrived last week, looks very messy but overall it doesn't appear to be in bad shape. My main concern was the eBay listing showed the front wheels pointing in opposite directions, which could mean the impossible-to-find steering crank would be broken. Luckily it turns out it wasn't, just had popped a ball joint. It doesn't have a Turbo Rocky body, which is fine as I always do a new one anyway, and I'll source from TBG who thankfully still produce many vintage bodies.
Here are some pics of the starting point. I'm pretty sure the chain has been installed the wrong way. The tyres aren't too bad, although the rear set were clearly on the front at some point and have cornering wear.
I'll post more as it progresses...