Hmm... having watched the episode now... I can't see that taking off without considerable adjustment. the outside it's not an awful looking thing, not bad at all really but it does have a bit of the 'commercial' about it, it looks a bit like a classy visitor centre for something. Not bad though.
Inside however... it just didn't work. The grid pattern everywhere was stupid, especially when it started bisecting the carpet upstairs. Thats certainly not to everyones taste. It's not horrendous and it's liveable and indeed, in parts, nice, but I can't see it being that popular.
But the big issue with it is that it's not a massively original idea. Other companies already do similar things. Indeed a family on Grand Designs has already done the pre-fab house thing, where huge wall sections, with built in pipework and cables, are just slotted together in a steel frame. In fact I think it's something they've had on the show a couple of times. I can remember one guy who did it also with experience from the commercial world where they do it for speed and cost.