Dirt floors are fine. no need for anything else, you just rake the bedding like you would any animal waste. I totally don't understand why you'd put any pallets or anything else down unless there's standing water or something.
I've had coops with dirt floors and wood floors and either way is fine. With a dirt floor, and if you're sure your hens will be in that stall for a good long while, you can change the bedding to a deep litter method, put in a good 6-8 inches of wood shavings and let it be. The hens will scratch around in it, and keep things mixed up. you really don't need to do much else,other than rake the worst of the poo out from under the roost and make sure the waterer doesn't leak and make any wet spots. Stir up any crusty areas, but your hens will probably take care of all that for you.
It really needs to be DEEP though, few people start out with enough, and then they fuss too much about it... but it sounds like you have a chance to do it. Here's a good link to some good info about it.
http://www.plamondon.com/faq_deep_litter.html
I find it much healthier for mine... but it's all up to you.
[edit] With a wooden floor, you can't let it be a total deep litter method, but you can still do it to some extent, I used to still pile it up high, but had to shovel it off to one side (this is about 3 or -mayyybe 4 times a year, and only if it's too damp when you check in a few places), clear any underneath wett-er parts off the floor to prevent that from rotting, and then re-spread the piled up litter out, adding more shavings on top, then do the same on the other half. (hope that makes sense) Any time you add more shavings, the hens all get very busy stomping and scratching again till it gets flattened properly! They're quite particular about that! it almost NEVER smells at all, and if it starts, add lime when you stir dig it up... or DE, but that's another discussion I think. It is much tougher with a wood floor though, so I went back to the dirt floor and used the wood floor shed for storage.