How many of the luxuries can you live with out, heat, ac, radio, sound deadener, power windows, spare tire and jack, if rain is no concern...inner fenders, install fiberglass hood/fenders/tailgate/roll pan, light weight seat(s), etc.
Heater removed. Ac gone as well, except for the compressor (using it as a pulley for the stock serpentine setup). The radio will stay. The spare tire and jack are gone. The power windows might go if I find some interior door panels or whole doors. Roll pan is in the works. I guess I just have to look and see what I can do without.