Those are 4 wide 12 deep, 4x4 house, 1/2 the run covered with tin.
And yep, we are fortunate not to have bad winters, so no real need to fully inclose them.
I will be happy to post more pics if it'll help you, these work very well. the run is 12 pens long, and the houses are on both sides, to save on expense and share the center, basically a 24 x 48 pen split down the middle w/ 12 pens on each side for optimin use of space and materials..
As for the genetics question, maybe someone will say on that, I am just learning all that stuff myself, would be nice to have though!
Aubrey