first thing then is to invoice for say $10M for project feasiblity/production engineering/design/whatever. This is the acid test on guys with bags of money and crazy assed ideas. Oh, and stamped drawings for anything your asked to build
The thread reminds of a zip line buddies and I made, must have been 10 years old. I found a good length of steel rope at my grandfathers and talked dad into getting the U bolt cable fasteners at the hardware store. Perkins hardware in Unionville Ont, back before it went to shit and became trendy. back then it creaky wood floors, bins of nails sold by the pound and Reg Perkins called my Dad Jack. Neither of us knew why, his name was John. Now its a candle store or linen or something. I suppose thats a better outcome than a bulldozer and a wallmart
Anyway, we lived a mile or so out of town in the woods with a stream. We connect the cable from a tree (part of my fort) on the high side of the river and the opposite side as high up on a telephone pole as we could get with ladders. Tony, strongest kid of the bunch, was the tensioning device. We were amazed at how taut he got the cable. We used part of an old block and tackle with a seat hung by a rope.
It did work, and nobody died. My great fears of ploughing into the telephone pole at great speed were unfounded, with the weight of a kid on the line making it a pronounced V shape, we were safely deposited on the grass on the other side of the river