Hi,
I went with a witdh of 0.2m only, and different design.
Here it comes for the wall set:
Wall w Window / Medium Wall / Small Wall / Wall w Door
And here is a quick test to build a 10*6 m house (only walls) :
I like that new way to build things 
Cheers !
P.S. I also made sure to commit changes with the git bash console (I didn’t download SourceTree)