Good luck in building a Stealth copy, my young friend! T'will be a fun and rewarding project for you.
I think what some of the other guys were trying to say was that there are a million factors to look at when taking on the project of building/repairing a guitar. As you take on this task, I think you will find this lot to be very helpful as you come up with quagmires in building your beast.
You won't find "plans" as such for your specific guitar, but you will be able to find wiring diagrams for whatever layout you go with, tips on how to set up and intonate the bridge of your choice, etc. One thing at a time, though.
I would suggest starting with one of the pix of the model at the BC Rich site, and blowing it up by whatever means necessary to full size. Thus you can begin your woodwork, and start asking questions as you hit each roadblock.
PLease keep us informed as to how it goes!