Check and see if he still has the backglass trim. Should be four pieces, including the lift trim that goes across the bottom. The trim also holds the translite in place.
I'll get the measurements on the glass when I get a chance, if no one posts them first.
Apparently original translite glass was not tempered. I'd go tempered, just to be safe.
You might also want to rebuild the flippers, unless they currently work perfectly.