So I'm building a garage in the back garden roughly 5x5 m long by 4.5m wide, it's up against the fence to my one neighbour so my height limit is 2.5m, it will have a flat rubber roof, I really want to fit some sort of ramp, my thoughts are most ramps are approx 2.8 m high so I can lower the floor, I'm then thinking if I build a box frame roof with a 3-600mm skirt around it and put a 4 port ramp in the middle I can then fit adjustable height props to suit the height of whatever car and lift the car and roof at the same time, what are everyone's thoughts on this, I'm thinking if I build it to suit it won't really cost more