You might be surprised to learn that if you can pick up a secondhand tank for £40-£50, a non working Heng Long would be ideal, then you can buy a Clark board and almost pop it straight in. You will have a full function tank with sounds, momentum inertia, Tamiya compatible IR battle system, and all fully programmble via a tv remote, for around £100 all in?
This one cost me £20 for the tank, it runs on plastic gearboxes and tracks, all I had to do was make it how I wanted it, and stick a Clark board in there. Bargain.
http://www.youtube.com/watch?v=IWHsOvQ7 ... hu6FqMWtJA
You won't need any of the original electronics so if someone has blown one up, it's just what you need.
I have bought a couple of basket cases off Ebay and done that, and they make excellent tanks.
You can spend as much as you want, with systems ranging from £60-£God know how much.
If you are able to get to the Cardiff area then hopefully by next summer the South Wales/West Armoured Group (SWAG) will have a full outdoor battlefield up and running. I will know more on 21 September, so will post an update, or look on
http://www.HitEnter.co.uk
which is where all updates will be posted.
Cheers
Rob