JimC:Do we want to talk best practices and options on them for hose routing, bottle placement, can light management, etc? Even with a dozen ways to do everything it should be possible to work out a list of things that work for most people. For the interests of brevity and the target audience, we should stick to Floridian sidemount with some occasional, short term bottle removal - something like Jug hole.
Hose routing can be regulator dependent,but still preference is to be as clean as possible with no bulging hoses to the side or hanging down. Jug hole you mentioned is a place that when going through the bedding plane on your belly,it will tell you very quickly if anything is dangling down.
I think the key to look for is hoses that route cleanly, tanks that sit laterally along the body as if they were glued to your side,light cord and canister that is clean with no ability to get caught in a restriction,second stages that are up off the bottom and in an easily deployable location,SPGs that are easily viewable and away from entanglement etc.
Many people choose a recreational sidemount configuration,so they have no intent of ever removing tanks,but for those people choosing to do passages where tank removal is necessary,then a rig that allows this to be easily and quickly is necessary.