In reference to using a RC chassis . . . This is one I did many years ago:http://www.societyofrobots.com/images/mechanics_chassisconstRC1.JPG
You can't really see it, but in the front I removed the DC motor for steering and replaced it with a servo. I used a motor driver to control the motor. It worked decently well. My recommendation: don't buy a cheap RC toy, get something with good torque!
As for a drill, buy a small table top drill press
. I use it all the time! You may have trouble finding one, however . . . ask the people at the hardware store about this . . .
Also for capacitors putting the wrong kind of voltage capacitors into the circuit can ruin it all?
Yep - you're best getting capacitors with at least twice the voltage level that you are using so that they survive any power spikes. Since you're probably using low volatges ie 5v or 6v then you should be ok as its difficult to get capacitors with a rating less than about 16v.
Well, it wouldn't 'ruin' it, but caps explode if they are under-rated . . .