The walls in this set are my second try for a street setting. I used them for a RPGMaker MV test. The tileset A3 should work fine and is able to expand. It comes with the background walls, that also can be used as they are. For another way of detailing I tested concrete and wood borders to use the automatic function that comes with RPGMaker. This set should also expand the streets pack. You want to use my sets with RPGMaker (MV). This could be the last part you need. 

It also works great with the naturals 01 and 03 that I've tried to create stylistically appropriate and match up.

*I recommend using the Cyclone-Map-Editor (Live Map Editor 1.12.01 by Hudell) to get a better grip on the different layers.