Rick,
I used high impact plastic for the hull frame. Its came in difference thickness and size, In fact most of the parts I used the same materials as well. And yellowish plaster is a polly putty, it's the same materials for real car putty. Both are purposely for industrial used. And a few size of wire that I had bough from electrical shop to make a railing.
We have a very limited source for hobby stuff here, therefore I've to make used to what ever that's available and cheap here.
Hope that's will help,Thanks
Naza