why build a replica when you can improve on the original.
you may be better off just looking at a pic and digging up the old info from the fender site.
i know they are vintage frets(medium small) im not sure about the sizes tho.
two three way slide switches
1 humbucker
1 single coil
two pots
some wire
a slab body of basswood(thats what the jag-stangs are made of) 47 mms thickness
some rock maple and a veneer of rosewood.
6 tuners
a trem system
bridge, thimbles etc
neck plate
4 neck screws
a pickguard with some screws.
a jack
some paint and clear coat, and i think thats it, its pretty simple. no frills or anything.