I'm getting myself back into rocketry, except this time, it's high-power rocketry. I want to go back to designing my own rockets, which I've done before, but I want to find a program that's capable of taking a 3D model and converting it into standard engineering schematics. It also needs to be able to assemble a larger model from premade parts. (I know that's a fairly standard feature, but I've actually found CAD software that doesn't have it.) Simulation capabilities aren't needed, but would be nice.
Anyone have experience with free non-rendering modeling programs? I've used a couple of paid ones (ProDesktop and Rhino), but I'm on a bit of a budget.