hi @balticbadger -
Marble is a stone that is in plentiful supply around these parts, everything is made from it. Also, a lot of people seem to use Concreate. I think most of the tombs are made from Cement then covered with a Marble top. ITs a good question tho, I wonder how much a fance internal home like this runs. I will ask some of my friends and post if I get a good response. :)