Though I am familiar with the cheat "constrainfloorelevation false;" I can't use it because the garage door would then no longer be level to the ground. Thus the garage door would look awkward and simply out of place. Using "constrainfloorelevation false" means I would have to build a wall, level that wall, and then build a second wall on top of it, just so the wall has a height. Once that height is achieved, items such as doors, (particularly garage doors) will no longer be leveled to the ground because of the first base-leveled wall. I need to build one wall (or cube shaped wall as the garage), leveled to the ground; that wall then needs to be surrounded with foundation. The project takes places three stair levels below ground.