I know he has upgrades for about every other guitar, he should possibly have one for a SG and if he dosent, he should be able to put one together for you. BTW, all the stuff in his kits are TOP of the line stuff! No cheapo parts at all! Best you can get parts, the only way to do it!
www.acmeguitarworks.com/SG-C163.aspx Here is the SG kit ... but you probably don't need the switch. Just order the pots, caps & volume kit. Get them to send you a few other orange drop capacitors .015uf, .022uf, .047uf are the best choices. You can do all the wiring and put these in last ... makes a big difference!