What Joe did was give me the scale dimensions of what they were looking for, and I drew it up. I looked through pictures and diagrams of small loading ramps and team track ramps, and found one that looks like this one. I think all the model manufacturers design the same ramp.
I wanted to include nail holes, and make it a simple peel and stick construction, so you don't need any glue. Takes 10 minutes to assemble using tweezers and an exacto knife, then I like to spray the underside with Floquil Roof Brown so it looks creosote treated, hiding any visible transfer adhesive.
Anyways, I cranked the design out in a couple hours, including instructions, then sent a finished one along with a couple in kit form as proposal samples.
So I made a few more with different lengths, and one with a track bumper end for a larger platform, for my own trade fodder.
-Robert