The archway is actually my wall. It's still not done, I'm sure I'll change the entry ways and make them a bit more elaborate then they are right now. I just started the build on a new flat map last night. Let me attach a couple pictures so you can see it. Let me run out and build a wall and get a couple different ideas for a stall for you. I know my fiancee is having the same issue with building a market place. If you're looking for inspiration the only place I can think that you would get to see stalls, as silly as this is, is from the movie Aladdin.
This is from the inside of the wall. It completely circles the village as a wall / walkway.