I am not trying to give advice but here is what I did.
Bought an Aluminum Body from JP Off Road, so far it is on the money for mounting pad location and angles built in to the body.
There are no holes in the tub at all, even the body mounting pads are set up so you don't have to open the inside to the outside.
The door, hood and tail gate mounting points are reinforces with an additoina 5/16th aluminum in side of the body, again you don't have to drill through but I think the hinges will be more secure with through bolts.
The weight, four people can handle the CJ8 tub without a problem.
Drilling the aluminum to mount everything is best done using "Auto Trans Fluid" as a lube (A MUST).
Keep your old body as a templet, just incase you have a measurement question.
Anything else, just ask.