Hi There,
I chose DRB because I wasnt very handy and it looked like the easier & cheaper build. I used an LH Torana as the donor. I used the front end, steering, rear end, pedals and braking system. I found the wiring useless as it was old and of little use with a modern fuel injected engine.
I rebuilt (or had rebuilt) every part. I have a 220kw engine (auto trans) and the diff seems to hold up fine. I had it rebuilt with fine spline LSD and 3.9 to 1. If your planning on a more powerfull engine then you might need something better.
I can send you my build manual if you like but it might be a little different depending on which DRB kit you get. Or you could try asking DRB for one.