Not a bad idea. it would be quite liftable in that case. But if I was going to build one, I would make it a full case.
if you could get 1 cm granite, I don't think it would be anymore than 50 pounds.
If its 2 cm, it would be crazy heavy.
Toronto Granite Prefabricated Granite Countertops Kitchen Vanit
Not any relation to me, but any of the colors in the first picture would make a kick ass case.
If I was going to build one those, I would use emerald pearl color.
What I would do to simplify the process is gut out a full case for the rails.
Atleast it would be flame proof.