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so obviously the ramp will have an angle at the top...so what you do is make the frame from the down ramp first then attach it to the flat part of the big start box. to do this you must angle the two or 3 supporst for the down ramp so they go flush to a 2x4 so that can be attactched to the big box. hope that makes sense
ok so i couldnt think of a way to describe it so i made a picture and thats looking straight down on the drop in. the rectangular red thing is a 2x4 you put between the two 2x4s that make the ramp. then you screw it in the ramp and the frame of the drop in. thats what i did anyways