Well this is really late but, If your villa was built in 70's then you should not have any problem with the wieght. Houses that were built back then did not use premanufactured trusses for a roof system. therefore you should have footers underlying your load bearring walls such as exterior and the main enetrior walls. Also the concrete wouldn't long been considered actually cured. I hope that this helps. Oh yeah, for the frame of your stand I would recomend doubled 2x12 across the front and back with supports every 2 ft. At least a 4x4 every 4ft under the doubled 2x12.