Grade Crossing (Straight) for O Gauge Tubular Track V2

This thing is a wooden grade crossing designed for O gauge tubular track. The design consists of two OpenSCAD programs, one makes a crossing for straight track and the other makes a crossing for O-31, O-42, O-54 and O-72 curved track.

This thing is the straight crossing, for the curved version look here https://www.thingiverse.com/thing:2832224

The top of each piece represents wooden boards that are bolted together to make the crossing. Each crossing consists of four pieces. The two cente