Saw an interesting YouTube from " Adam Savage builds" series. He creates a spaceship using a carved block and styrene plastic. He shows how to vacuum mold the components using his DIY vacuum forming machine. Also he carves out the mold ( buck) using a polyurethane material called Renshape
Freeman supply.com. See the video at https://m.youtube.com/watch?v=7uS7A4x31PY
Fraser
vacform is very interesting to me, some models require a lot of small carving,a lot can be done here,now know how to put a piece together, very informitive