CoCreate 3D Solid Modeling. I can output any 3D file format you want, and 2D also.
BDL, PKG, JGS, DWG, DXF, and on and on. hp actually wrote the software for unix years ago, and it was known as ME10 and ME30. We sold the rights to CoCreate, and they adapted it for Dos/Windows. Powerful stuff. I have some samples of some of my design work from it.
The individual parts of these models are accurate down to the last
fastener at the micron level. Valve covers would take me no more than
2 or 3 hours. The front cover also has the clips for the plug wire retainer.