Now, I know some people are gonna be saying "inflation in Roblox would just be a ball attached to a lego figure" and they would be right. However, I generally enjoy the story or situation of inflation more than the visual, and that's obviously just my preference. Even though it doesn't look great, it's still useful for being so easy and quick to mod. In a couple hours, I can make a few scenes of progression and bring a bit of excitement back to the stories I've already read 100 times before.
Anyway, for anyone interested here's a base world I've been using to pull assets from. https://ufile.io/b4217 (it's .rblx so it only opens with roblox editor)
I only made the two conveyors and edited some stuff together. Most of this stuff is from other people.
Oh dear, Roblox. I never thought I'd see the day where it'd wind its way up here. I'm not sure if any other browsers on this site have had an account. As a user from 2009, I'm rather apprehensive about what you're going for but still curious.
I know that the site had some inflation fan groups several years back, but they were deleted. Besides, since most of the userbase was anywhere from 10 to 16 years old it was just about eighty users or so making giant plastic spheres with little arms and legs and saying "WOW I SO HUGE <3333". Kind of distressing when I think about it.
Following your link it doesn't seem like the fetish interpretation in Roblox has turned out much different than it was before.
Check out my stories that I've written...!