ha...id say you will find like 6 total, its a very uncommon map type
regardless...i assembled a list of that type of map 4 months back or so

bear in mind these passed through my screening to confirm it was server worthy...namly no bad lighting, everything function, and its not 100% dev textures (these are not listed in order of quality)
1) Bloodstained - 1st two stages are relatively good examples of what makes a good dustbowl map...(aside from the inversed teams...) 3rd round is well...long...and...uhh...long
2) Boulder - fun map, with valve quality detailing, haven't played enough to locate the specific nuances
3) Junction - "Looks" like it might be a good example, detailing is a bit...incomplete, and unsure of the gameplay, but it passed my quality control
4) Castle - Gameplay-wise its not a bad map, a few too many lock down sentry locations and long corridors. Its not in tf2 style, do not take any detailing idea from it.
The ones I rejected included:
1) Aqua - the lighting, namely the reflections were far too bright and were starting to bug me, take a look if you want, i know nothing of the gameplay potential
2) Siege - An excellent example of quality gameplay, absolutely love this map, rejected due to dev textures
3) Egypt - Really...really bad fps, ive heard of large gameplay flaws, I honestly know little about this map
Other Rejected, both of these are one round dustbowl maps, one of them is amazingly detailed, the other is so bright you can feel your eyes start to burn...
1) dunder
2) yeehaw
im leaning toward yeehaw being the better one...but i just can't remember
Other then that I watched a few others quietly die out...
1) My map backfire r1, the walking distance was far too great, the 2nd cap was too easy to get, and the 1st cap could be taken with a single uber, you might take something out of it, but i would not expect much
2) Snipergens 2 round dustbowl type map, fun, could be locked down by a single uber sniper...and is all dev textures, some gameplay ideas could be taken from this
EDIT: i can likely answer any setup questions...the only maps i made are this type
