Probably the pickup that is in the 2nd pic will be the 1st major project.
i also have a 79 malibu wagon that im going to build into a drag and drive car
we sprayed a sealer on it a few hours after it was poured. ill see if i can find what he used. It has a nice satin look to it
Mini split will go in the same wall the breaker panel is on, in the second gap between studs