An indestructible car!

Bought this about 9 years ago from a kid I was teaching. Paid $50 AUD and it was practically unused. Got a group of kids together and we ran them around the car park after school every week for about a year. It took quite a hammering, but the only thing i bought for it was new front tyres to try and cure the chronic understeer. Battery looks a bit sad, so I must have cooked it at some stage. Once I have rebuilt my mates TA01, I'll get this running again so we each have something to aim at! Gearbox looks like it's missing a cover - anyone got one?