That’s EXACTLY what got me thinking about using Gundam Miniatures. I always wanted to play WH40K, but it’s just sooooo time consuming… AND expensive!
A long time ago I used to play a game from Jackson Games called OGRE. It had to do with futuristic tank warfare. They recently had a kickstarter which got OGRE back to the Tabletops. I bought a few OGRE Miniatures with the intent on playing, but screwed around with “what if” situations with Gundam Gashapon (since they’re 1/285 scale like the OGRE miniatures.)
Anyway, after Googling a little while, I found a community of players who play with Bandai’s Official Miniatures rules… but the rules are kinda vague. I started playing Star Wars X-Wing Miniatures with friends but we were kinda dismayed at the lack of factions (and different ships) available. At least with Gundam, there’s LOTS of different factions and Mecha to choose from. So anyway, we’re in the process of modifying SWXWM Rules for use with Mecha.