You can do things to your Strat to make it look more like a Jem, but it will never really look like a Jem. There are some pretty significant body differences, even if you rebuilt the trem, trem cavity, neck and pocket, monkey grip, lions claw, output jack, pickups, etc., etc. Frankly, it would be less work to build a Jem-style body from scratch. But if you just want to mod up your current guitar, go for it. It's yours ... do whatever you want to it.