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I built a duckunder across a doorway, to extend my main line. I use 3/4" BC plywood for subroadbed, and Homasote for roadbed. The line is single track at the du, and makes a curve through from one wall at a right angle to another. To maintain rigidity, I bought 1/8" x 1" aluminum strip, and epoxied and screwed it to the curved sides of the du, with right angle brackets, mounted underneath the plywood subroadbed. I installed a piano hinge at both ends of the du, and installed the track. I then cut through the track, roadbed and subroadbed, centered over the joint of both hinges. I replaced the wood screws at one hinge on the wall side with threaded studs. When I want to raise or lower the du, I unscrew the nuts from the studs, and drop the du. The reverse procedure puts it ack in place. The piano hinges and aluminum strips keep things in alignment. I hardwired leads from one pair of stock rails to the bridge rails which form the du. The layout is in my basement, and the du has been in operation for many yeaers, with no problems. After a year of so of running, I cut the excess off the right angle brackets, and the aluminum strips look sort of like a truss bridge. You want to use small piano hinges with a number of scew holes in them. Make sure you intall them with the roll of the hinge down. The aluminum I got at Home depot. Good luck & enjoy.
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