i scored a truckload of 3x6 1/4 inch wall tubing once.. (it was my payment for helping do a demolition job)
i brought it home, made a few cuts and created one of these style lifts..
I must say that it was the most worthless thing I have ever constructed..
(every try pushing a dead car up a ramp?)
I was sad the day that I hauled it to the scrap yard.. not so much because I was disposing of 3x6 tubing, but that I had moved said tubing two additional times before doing so..
for what its worth.. I have had 2 mid rise hydraulic lifts that were bought for right around 1000.