Hi Andrew.

Sorry to hear that the bridge and tail-piece holes are not there. I do not think that is a common problem!

Anyway, I have not done this build, but have done a set neck DSCM-1, which has the same tune-o-matic style bridge and tail piece.

From the back of the nut I measured:
628.5 mm to the centre of the high e side hole,
632.5 mm to the centre of the low E side hole,
and 674.5 mm the the centre of the tail stop holes.

Normally the neck is placed relative to the bridge to ensure correct scale length of 628 mm for the high e string.
You will need to place the neck (and make sure the neck pickup and pickup surround can fit around the neck pickup route), and then set the bridge length to suite the neck!

I assume you have access to a drill press at the school.

I hope this helps, and good luck.