Ok, after giving the matter some more thought and dredging up some old structural engineering from college days, here is plan B. A monolithic pour that will be about 11 1/2 feet wide, 5 1/2 feet front to back and about 2 feet thick. Total weight will be about 5500 lbs. Will use fiber reinforced concrete mix with a re-bar or two thrown in for good measure. The lift posts attach via 5 12mm bolts (each side) in steel anchors. Bolts torque to 95 ft lbs. Each anchor will have at least 6" of concrete around it. Will allow 7-10 days for strength curing time. What say ye to this design?
