I spent weeks designing all the casting and machine from casting models for this compressor (lots of internal parts you can't see)... creating an assembly... etc. Wasn't much to do to the actual assembly to get ready for rendering other than remove internal components, attach remaining Xrefs and exploding the blocks.
Took about a half an hour to assign materials, draw up a quick table for it to sit on, and render. The render is more for showing off the unit more so than trying to show my lack of rendering skills. Wish I could show the inside... lots of cool stuff... but can't due to confidentiality agreement.