Errr...aren't all SG's flat bodied ? A LP trem is made for a carved top so it's not really suitable for a slab fronted SG. Oh, and another thing - the string spacing on TOM's tends to be narrower than trems, hence F spaced pickups, so you may want to check that the 'E's aren't gonna fall off the side of the fretboard before you start buying things and hacking holes in it.
Jem