Since Open WarHex by GarageBay9 has a bit of a peculiar format (something with decimal inches) it will be imported into Cura in a tiny size. To get this up to Classic BattleTech size (where a hex field is 1.25"/33mm from flat to flat), you have to scale it 1,885 percent. In addition, the original files were missing other Water hexes than 1-hex baseplates, so I created 2-hex, 3-hex, 4-hex, and 7-hex water baseplates in Depth 3 size in TinkerCAD (my talent reaches only so far).

Also, since I had the idea to build a game table all out of Depth 3 baseplates and place Terrain plates on top of them, I needed to create a terrain plate that would hold the 7-hex baseplates together. For this, I created the two three-hex terrain baseplates. I confirmed that they do, indeed, work, and once I have printed a sufficient number I will put up a photo.

In the future, I might create more hex plates as the need arises, so I tagged this project as a work-in-progress.