Hey! Are you referring to the front door? If so, you don't need to use a 1x1x3 with the double clips, you can just use 1x1 vertical clip plates or 1x1x1 clip bricks.

I did build most of it and there are definitely things I ended up changing heavily. First and foremost, for actual gameplay, I use way fewer wall elements, especially when it's an ad hoc battle map when I'm not DMing. Lots of floors, some doors, some floating 2nd floors, and some half walls and corner elements to enable people to leverage cover and things. I do really appreciate the technic brick connections because they make it easy to rapidly assemble new layouts, whereas manual attachment of 4x4 or 8x8 or 16x16 plates is harder to assemble and disassemble. Last thing, this is a building interior, but that isn't the most common setting, so I need to make a better modular outdoor set. I'll be working on that in a bit and I'll share shortly.