My wife and I built this over Memorial Day weekend. I designed this primarily for a 7 year old, so I didn't want to make it too radical. I based it on some of the pipes I saw on these project pages, like the "basement mini ramp" and some others. Thanks to the project pages; they were extremely helpful in determining my design, so I'm posting this with the hope that it will help others. Note lumber prices have spiked in the last year! Transition radius = 75 Ramp height = 24 Platform length = 24 Flat bottom = 72 Flat bottom height = 3.5 Materials list: (3) sheets 3/4 ply (5) sheets 3/8 ply (5) sheets 1/4 masonite (33) 8' 2x4s (2) 1.5" pvc 10' conduit Box of 3" nails for nailgun Box of 2.5" ss square head deck screws (2) tubes construction adhesive (3) gallons kilz primer (1) gallon behr porch paint Materials cost = $550 Time to build = 20 hours (2 adults) not including final coat of paint, which will be done next weekend.