fender strat guitar necks

Will a 62′ Fender Strat Guitar Neck fit on a Gibson SG guitar body?
Im trying to build an awesome guitar out of pieces
Not easily. As said by others, the Stratocaster neck is bolt on, while the Gibson SG has the neck glued into a deep, tapered pocket. If it’s an Epiphone SG body, that could very well be a bolt on neck and might fit with some minor modifications.
You can try to take off the neck of the Gibson SG, but that glue is meant to keep it in there forever and will not let loose without a major fight… I guarantee you’ll lose wood before glue. If the neck’s already shot, you’d have to carefully saw off most of it and then use a router with a template to create a pocket that would accept the Fender style neck. I don’t recommend that, though. It’s a lot of work and, unless you work very carefully or really know what you’re doing, might just make the body unusable. Beyond that, an SG body with a Fender neck would take a long time to set up the neck angle properly and get the right scale length, wouldn’t play very well, would be unbalanced, and would look pretty weird.
If the neck is really a ’62, it’s worth some money and could probably be sold as a vintage part for a decent sum. If it’s a reissue, it would probably look and feel a lot better on a Fender style body. I’ve built/rebuilt several guitars using Warmoth parts and am sold on the quality of their parts. An alder or ash body would sound excellent with that neck.
http://www.warmoth.com/guitar/bodies/strat.cfm?fuseaction=strat_standard
Warmoth also sells bolt-on SG bodies and a variety of other styles like the Fender Jazzmaster & Jaguar, Gibson Firebird, etc. Their necks are some of the best in the business and worth every cent.
Allparts and Stewart Macdonald also sell decent bodies, but I use them mostly for the other parts like bridges, tuning machines, etc.
(NOTE: the following poster makes a valid point regarding the different scale lengths of the two instruments; however, if you’re going to have to use a router to create a new pocket, it’s not much of a stretch to have the pocket placement equal a 25.5″ scale length. It would be more work but more stable to join the neck lower on the body and to remove the bridge posts, fill them in with dowels, then drill new holes to put the bridge lower. As I said originally, it can be done, just not easily and probably not with the best results. This is why I suggested alternatives.)
Mounting A Custom Warmoth Neck on a Deluxe Strat Part 2 of 3