The mouse is super easy to find, and cheap - just get an SE mouse if you need, it's the same just slightly more gray. (model M0100)
The keyboard uses a phone jack-style cord, very odd. You can get them with the cord on eBay for about $30 in my experience. (model M0110)
PLEASE, just don't gut it or ruin the thing. They are quite hard to find now and there are quite a few collectors who have been looking out for them that would gladly buy it from you. I mean, it's yours to do with what you will, but... think of the children!