Using granite blocks for a supporting base for a cnc router ?

[the great waldo]

Hi All
I think i'll give up the idea of tie rods and just epoxy or cement the two blocks into a steel welded frame. Does anyone have any ideas as to fixing the base onto the granite. I figured just drilling some holes through the granite and connecting them with bolts and t-nuts into the ali extrusion. I've attached a couple of photos of the base plate. It's machined flat the base is 20mm thick and the ali extrusion is 60mm square. All comments gratefully accepted

cheers
Andrew