Dress form advice?

I have made a dress form for my MDD chest and torso, as that's the only pieces I have in right now and don't want to be poking the vinyl trying to make some clothes before I finish building my girl. I want to make it more permanent than the water activated kraft paper I used over plastic wrap. I was thinking of using some kind of spray expanding foam to fill the center and sand down the outside layer of paper to get it back closer to actual measurements, then lacquering/painting it. Sounds like a plan, but I have no idea how to go about doing this.... I'm thinking a dowel for making the dress form be able to be mounted to a wooden stand base so I have the height right too. Again, no clue how to do this, so any advice is happily welcomed!