I recently completed a bench patterned after Chris Schwarz's Holtzapffel. I deviated from Chris's design in several small ways, that better fit my needs and interestingly move this design closer to the original Holtzapffel. It's 7.5' long, has tool tray, tail vise, and can be knocked down for transport.
I have about 40 pics showing construction details I'd be happy to share -- can anyone recommend where I could upload them?