these picture are of machines which have had the covers removed to show the inside.
its quite easy to put guards over the moving parts
while searching out an engineers to build a frame I found 3-4 companies who specialize in building prototype machines for companies, one of them builds machine for oil rigs & deep sea trawlers, (these places demand 100% reliability) for a £1000 he'd sort out the drive transfer & build a machine for me, I'd just drop of the engine, blower, pump & heat exchanger.
I'm asking a question at the moment about on the ICs board about turning a 56 blower at 1750rpm for my next self build.
basic knowledge of T/M mechanics is all you need to build your own.
Mike