You can pretty much make all tne tools you need with the exception of an NMRA gauge. A long stick cut to the distance between rails will keep track perfectly straight. Every couple of inches niotch out the edge so you spike the inside of the rails if you want. the Ballast spreader was originally an article in MR. I’m surprised that someone has offered it commercially for years with no recognition of the designer unless he received or receives a royalty of some kind that was never mentioned. There are curved section of varying radii that can be used for laying curves but you could even make them if you wanted.