As far as clearance goes... the pictures are of a midtower (enlight7237) install. The clearance on that midtower is about 3/8" to 1/2" between the power supply and the PolarFLO. If there was a clearance issue we'd be back at the drawing board
The compactness of the install is more than acceptable according to the published guidelines.
This is great stuff keep the comments going!
Best to all.