So, I was thinking about Sera T2 Sonar's blueprint file, which has an upgrade path to a t3 sonar that doesn't exist. I then remembered about the t2 mass fab it has. Here is the blueprint snippet:
UnitName = '<LOC xsb1104_name>Hyaliya',
UnitWeight = 1,
UpgradesTo = 'uab1303',
You'll notice:
- It has an upgrade path to a t3 mass fab
- Aeon's T3 Mass Fab
This is pretty odd as they're different sizes. I enabled this once, and you do end up with units inside each other, but the adjacency works!
Any thoughts about actually making this more official? It might be useful for making massfabs more viable later game.