[datashovel]

Thanks for the comments. I definitely agree, the construction of the perimeter would likely be more expensive because of the need for more precise measurements for modular components. And even without the extra work on the exterior it may be doable.

I guess the question really is whether the additional expense is manageable.

And of course I definitely think the way to go with modularity would be open source. That way the market becomes immediately inclusive of all potential manufacturers or DIYers.