You need someone that knows something about building ramps. The angle has to be correct or it is a pain getting up it, and down can be real thrilling if you are not careful. You also want the deck of the ramp made from plywood or very closely spaced boards. To far apart and the wheel of your chair will drop into the crack. From wheels on a manual wheelchair are only 1 inch wide and sooner or later you will need a manual chair too. Might as well build it right the first time.Had the wife go out and measure, where the ramp would be it's 38 inches, not too bad. I anyone knows a deck builder I would figure out someway to pay to get it built?