I'll try and get a pic up tonite for you.
My sump is just for the skimmer, filterpads, and a common area for drain for dosing pump/ calcium reactor, overflow drains, return pump, etc. Having a sump makes things much easier.
I have some burrowing fish, 2 engineer gobies. Been with me for a while now. They don't seem to mind, they're getting along just fine. They're always next to each other, I'm hoping they'll mate sooner or later.
For clean up crew, in a 100gallon, try 250 Astrea Snails, and 100 Hermits for a couple months and see how it goes. That's a little on the low side. If you see more crud or algae on the rocks add some more.