Desert Luxe Pool

Hi!

I'm trying to figure out how the pool was made in this promo image for Desert Luxe Kit.

The walls appear to be on small height with platforming, however the doors and windows don't work with small wall height and platforming. 

I've tried on medium wall height and raising platforms up by 4 to give the illusion of a small wall height but then I set the pool up as you can't place pools on platforms. 

Adding a foundation doesn't appear to solve anything either.

Any help welcome :D

Thanks!