(Sorry for third post) What can I do to make this part of the house the same?

[Battlefield 1943]

So I got the basic framework of that house that I made a post about earlier done, and ended up with this:





Thing I'm making:



What can I do to make it proportional?

[Ad Bot]

[Redconer]

Try to divide the inside into rooms first

[Battlefield 1943]

Try to divide the inside into rooms first

I'm talking about the foundation

[phflack]

what're you trying to do?
make the inside corner lengths the same?
straight part should be X long, diagonal from your image is 45 degrees, so ~1.414*X (sqrt of 2)

[Redconer]

I'm talking about the foundation

Uh
This is tricky