I'm really impressed. Looks like a winner!
I like the layout. Everything I see indicates a well-engineered unit, with lots of attention to detail. The drive train looks good, both the clutch end and driven end brackets are very beefy, great machine work and welding. Fit and finish look top-notch! I like the idler for easy belt changes. When I see the pic where speed is being checked with a stroboscopic tachometer I know this is no seat-of-the-pants engineering effort.
The little things make a big difference - from the brass (not plastic) dump valve to the 'burp' petcock at the HX high-point - nice. The rubber straps to secure the waste tank lid are decidedly low-tech - no sense over-complicating things when you don't have to!
I only have a couple geek-type questions - In the pics I see two different blower to waste tank connections. I like the straight connectors with arched hose better than the angled connector (weldment). I wonder which one made it to production?
Also, The main belt tensioner/idler - is it spring loaded or manually adjusted?
Good job
Sapphire!