Get two or four drills-maplin do powerful 18v cordless drills for about £13.

http://www.maplin.co.uk/Module.aspx?ModuleNo=221018&source=2001&doy=28m10http://www.maplin.co.uk/Module.aspx?...2001&doy=28m10

You can use the batteries out of these to power your drive.

Go to technobots and get two electronise speed controllers-

http://www.technobots.co.uk/acatalog/Online_Catalogue_Electronize_Speed_Controllers_351 .htmlhttp://www.technobots.co.uk/acatalog...Speed_Controll ers_351.html

While your there get the 40mhz 4ch transmitter-

http://www.technobots.co.uk/acatalog/Online_Catalogue_4_Channel_Technobots_40MHz_251.ht mlhttp://www.technobots.co.uk/acatalog...chnobots_40MHz _251.html

E-mail James Cooper and get some wheels off of him-whatever size you want(75mm,100mm,125mm and 150mm).These come with a nut in the wheel that just screws sraight on to your drill motors.

Go to your local metal/plastic stockholders and get a load of polycarbonate out of the scrap bin(6mm upwards should be enough).For about £30.

A decent robot for about £150.

I dont think ive missed anything-but if i have im sure someone will point it out.

Perhaps someone more exsperianced will give you better suggestions.

Hope i helped anyway.

Dan.