Mod or Full Game, just the idea of a Real-Time Strategy unit types game would be interesting to see happen and how it would play
If I had to say what it would look or be like RedAlert Gals by NCHProductions RAGals series - YouTube
But with more growth and fetish related, like Units when Level Up, Upgraded or Ranked Up in combat will get larger and larger
Updated 10/25:
Ok I had though about the idea and I think I have an overall idea what a RTS game would be like for Weight Gain and Other Fetishes as well ,It would play like Iron Harvest and Command & Conquer games in one with the needed systems, For the focus on Tactics > Rush and Clicks per Second
There would be 4 Main Buildings, HQ/Command Center, Refinery, Barracks and Thick Building/Factory with Upgrade Buildings and Defenses on the side
HQ- Is the main center of your base, It can build basic units as well food and/or supports to help Grow/Upgrade Thick Units
Refinery- Where all materials put and gaining materials to pay for more units, should be noted you can capture smaller ports and HQ can Passively gain Materials but Refinery will give you the MOST materials each time
Barracks- Builds All Infantry Units, There role is mainly giving Aid to all Thick Units and help in Flexibility and Adaptability, you could win by Infantry only though it will be an uphill battle
Thick Building- Build All Thick Units, Each one has unique way of play and can get bigger and more powerful over time
How do you Thick Units Bigger? From them Ranking up, getting Upgrades, and giving them Support items will make them bigger to around 5 to 10 ranks
Why build Infantry? There the only ones who could capture buildings, mix up and balancing in armies
What Tactics can I use? Any General Tactics will work as there will be factions with different perks but will let you do your play styles, being Common Styles or Your own Style
Steamroller, Rusher, Balanced, Guerilla, Turtle and etc.
Overall, Focus on Tactics not only gives options for all kinds of players but also helps when wanting to see how the units look when at Max Levels and More!