Second time around I've gone to build a custom panel and found Redco.com to be the place to go. Broad assortment of quality parts hits pretty much everything you'd need to build your own rack panels. They don't have the lowest prices on absolutely everything, but they're in the ballpark on everything and I didn't need to pay shipping from 3 different places to get everything I needed.
I ended up with Amphenol XLR and lower-end Neutrik TRS gold plated connections for the device side and Neutrik Male and Female XLR on the panel side to convert from the rear panel i/o on the Profire units. Canare 16-channel quad snake cable was on sale for under $2/ft but the Gepco GepFlex 16 channel snake is what I used in the past for connecting i/o to each Profire.