Thanks for the feedback and absolutely feel free to pass it on, it still is in draft version though, the finished one should be complete in a month or two (there's some pictures missing towards the end). I'll put a link on here when it's done.

I'll make sure the link is on the positive. I have suggested drill motors, but some schools will have money to spend on clubs like this and VEX, Ranglebots, Banebots etc are easy options for a newbie.

If someone could double check the relay wiring diagram that would be great, think I got it right but still have to Google every time I come to wire one up!

Thanks.