The Ray Kappe RK1 LivingHome looks pretty good, but the rest are definitely underwhelming to me. Even the RK1 suffers from some problems, such as a design made

The Ray Kappe RK1 LivingHome looks pretty good, but the rest are definitely underwhelming to me. Even the RK1 suffers from some problems, such as a design made without reference to the site its on - so things like views and solar orientation will potentially suffer greatly. Also problematic is the flat roof which is never a good idea for long-term leak and maintenance avoidance. As good as the wood siding looks in the picture now, it will not hold up well and will look terrible in a few years and create a big maintenance problem. I think the key to making the prefab promise work is to develop a kit of parts that can be assembled in a custom way for a specific site and client, thus optimizing functional requirements, views and solar exposure, and ideally integrating the house with the topography of the site (if the site is sloping) rather than building a very unattractive platform to put the house up on.