we all should keep in mind, however, that "natural" setups aren't always necessarily practical or appealing in terms of their re-creation and maintenance in the home aquaria.
while some spotted gar populations and most Florida gars come from relatively clear waters, like the clear water we like to maintain in aquaria, many other gar species/populations do not come from such waters...and i think we'd hardly like to replicate them in the home aquaria.
shortnose gars, for example often come from muddy rivers where the water looks like chocolate milk...who wants to have a completely opaque and murky aquarium just so the shortnose habitat is as "natural" as possible? most spotted gars come from turbid and murky rivers, bayous, and swamps...again, not practical to replicate in the home aquaria. the biggest gator gars come from waters you can't even see through, and longnoses are found in a wide variety of habitats, most not reproducible in the home aquaria.
we need to face the fact that a glass or plastic box is NOT a gar's natural habitat, and although we can do some things to make it LOOK like it, we'll never fully (or even mostly) replicate it. going for a practical set up that functionally keeps the gars healthy is the best we can do, unless you work at a public aquarium or have a huge pond (even then, there are many limitations compared to their wild habitat).
ideally a gar setup will have minimal obstruction so they can swim or cruise unimpeded through our (comparative to the wild) small tanks. overhead cover is good so they can feel a bit more secure. as much width as you can give them, and as high of water quality as possible (good filtration, regular large water changes). also reducing the amount of activity outside the tank that would cause them to spook...let's face it, gars are not naturally exposed to the same kind of constant lateral antagonism as they get in aquaria.--
--solomon