This is all the code 55 rail here, because it's going on a Z-Bend Track module so the track must match Marklin/Peco/MTL rail height, but the making of the handlaid flextrack part can be done with any code rail, as you just have to solder on the one rail.
After you have a piece of rail with ties spaced every 10th tie being a solder tie, I just glue a strip of wood ties under the one rail. If you use all PCB ties, you can just stick those underneath, but the point was to make flextrack out of handlaid track, so I can speed up the handlaid track process.
If you guys need any of these parts just email me.
-Robert