|My subroadbed curve needed about 6" of tangent to get to the doorway, so I offset my tangent line from the curve centerline and freehanded a short easement as above.|
One way to do that is to use a compass - put the point on the centerline and the pencil 1 1/4" out. But I didn't have a compass handy, so I used my ruler . . .
|Here's the subroadbed, ready for cutting.|
|Pro Tip: Cover any models & track BEFORE you cut - especially if your staging yard is in your shop. Ask me how I know....|
|After my nice S curve was cut out and spliced to my 24" curve (using a plywood splice that is 4x longer than the width of my subroadbed), I glued down cork roadbed following my centerline and tacked it in place to dry overnight.|
|Now comes the fun part - installing the subroadbed/roadbed. It's just a matter of placing it in place, leveling it out, and screwing it all together.|
Now that the subroadbed is up to and through the wall, it's time to deal with the doorway and dropdown. . . .