OP is lowkey a troll because replacing drywall isn't that big a deal. And that's the first thing to consider. The walls are contaminated? Tear them out.
>use sledgehammer and crowbar and hammer to tear out drywall
>buy new drywall
>hire someone to help you hold new drywall up where old drywall was
>against the wall
>dry
>wall
>nail in place

There. You drywalled. Repeat process until room is drywalled. Then you fill in the gaps between drywall pieces, use drywall tape, and fucking paint it. It's that easy.

The hard part of framing and installing electrical has already been done for OP.