This is a very simple resource pack that turns the catwalks from Catwalks Inc. into 3d versions. This pack only adjusts the catwalk & ladder models that are placed in the world. It supports the industrial, red & yellow catwalks.
The next version will likely have an option for the bars to be 1 pixel wide.
Grab the Catwalk Inc. mod here: https://www.curseforge.com/minecraft/mc-mods/catwalks-inc