I am thinking of building a cabin with a slab-on-grade floor. My plumbing experience is pretty good for a DIYer, a cople of complete new houses, but never slab on grade. Reading over this forum, there seems to be a lot of plumbing problems in slabs. Should I reconsider the slab? If not, how do you complete the shower drain connections? Through the hole in the bottom of the shower? Do you know of a good plumbing book devoted in large part to slab plumbing? Most I have checked do not even mention slabs. Any help appreciated.