Progression is the mother of invention...I was going to build the rail 30 feet long, but then I said to myself.....why do what everyone else is doing...and I mean EVERYONE....Osc doesn't want to be Dagmar, Lakeridge or whoever...let them, be them...let Osc be Osc...I did, also build a 20 foot flat down (single kink) box rail its 10" wide on top, 10' flat, 10' down...and to whoever said rails were expensive, your absolutely right...but boxes are at least three times more money to fab.
Cheers