Thanks for the replies.
I'm not sure about keeping the truss rod actually. I might just get a Hotrod from StewMac.
Monkey, the problem is I don't trust eBay for some weird reason. Also, to the best of my knowledge, you can't get a reasonably cheap seven string kit. Plus, I don't know if I like 7 strings that much. If I don't, it will be flogged and something else bought. If I do, let the mods begin