Advice on getting the HVAC box out late model?

I have an 86 turbo, and I have everything out of the interior except the darn HVAC box. I am removing all the smelly, heavy, and useless sound deadening, going down to metal, then making my own lizard skin and redoing the interior. There is some extra sound deadening under the HVAC, and I tried removing some bolts, but the thing won't even budge. I tried looking for some writeups, but all I get is that it is a PITA to remove and something about bolts in the engine bay. My google-fu is not enough.....

Anyone know a good writeup on this? Or have done it and can give some advice?

Thanks!