Wanting to build a garage (Need advice)

10 ft will need scissor truss to clear the lift.That means crawling storage up there. Are you sure of height by code? Raise the wall height, go to 4/12 pitch to lower total height? Metal building is sweet.5" concrete, but you want about a 2' by 2' footer for the lift. With rebar, a lot of weight/pressure in those spots.