They also have tent carpet - not the fluffy stuff like Outwell etc but a woven type like we have for use with our Cabanons.
I know they will ship tents to the UK and am hoping they will send other things at not too high a price (off to investigate postage costs).
The bucket groundsheet in our Litchfield Creek works in a similar but non-inflatable way, the sheet goes a few inches up the wall of the flysheet However, that sheet is fitted so you don't need to step over the raised part when you're moving about inside, and the sections by the doors can be flattened so that you're not constantly stepping over the thing to go in and out.
On the over hand you could use it as a big shallow paddling pool.
Wouldn't it be like walking across a bouncy castle, I can imagine things falling over as you walk past and move the air around. As for hardstandings..... But maybe all that has been thought out.