Like I mentioned, the layouts aren't great --unless-- it's one designed by a known architect then they can at least look nice from the outside, yet they are still constrained by the dimensions --which can be from 12-foot wide to about 20-foot, in most cases. Here[1] is a sample of stock that's about 30yo. in the background you can see the roofline of a newer design.

[1]https://imgur.com/a/pdHmByZ