Here are some bases to replace the ones that come with Monster Hunter Figure Builder models.

I used TinkerCAD to overlay the "Terrain" shape generator model onto OpenLOCK templates. See my Sources list for other models I remixed for this project.

I only made bases for the figures I own. Four of them - Kecha Wacha, Seregios, Rathalos, and Yian Garuga - all use the same base, for flying monsters. Since Najarala, Nargacuga, and Rathian use two posts, I had to customize the distance between the holes in the bases. The holes are hexagonal; I used 4.20 mm x 4.85 mm, but you might want to play with different sizes depending on your printer.

Use the OpenLOCK clips to snap bases and edges together. I recommend two clips per side for stability, so to reproduce my complete base, you'd need 44 clips.

Enjoy!