Building mods on top of other mods

Hello, 

I was hoping to try making a mod with structures using a pre-existing mod's blocks and parts. However the other mod seems to run on Forge 31.2.44 and so I cannot open a test environment in MCreator. I also cannot access any of that mod's unique blocks or recipes in MCreator.

Mostly I wanted to enquire as to whether it is even possible to do what I'd like to try in MCreator? Will I have to wait for an update to use a newer version of Forge? Or is this just simply something that MCreator likely wont have the functionality for (Which is cool, programs can't do EVERYTHING)

Many thanks!