Each Casa Bubble structure comes with a wood floor. Rooms are large enough for king size bed with plenty of room for some additional furniture pieces.
The Casa Bubble houses are not meant to be permanent structures and are actually being marketed for temporary exhibitions, temporary eco-tourism structures, and special event occasions. Each module is made from a recycled/recyclable PVC material and leaves little impact behind on the land that they touch — just be certain that you are not crushing any endangered foliage, and that set-up does not require any major removing or clearing underfoot.
If you have a large enough space, you can set-up your own temporary bubble tree empire. The various modules can be added to indefinitely.