RTF is a global modification that replaces all towns in the game.

In my opinion, creatures shouldn't become completely different after an upgrade. A ballista turning into a flamethrower is a bit much. Although, who knows what those dwarves are up to.

It's not a ballista, but a marvel of hostile technology:D from this point of view, such an upgrade looks normal (at least it's better than the old, good rakshasas).

It looks clunky.
And can't you make it move without animation? - I don't know exactly how it works, but why does it need animation to move? - at most, the non-rotating wheels will be noticeable.

Regarding the growth, I want to say that the mod already has a level 4 creature with a growth of 3 per week - goat riders.
Regarding movement: if you add movement animation, you'll have to remove one or even all of the dwarves. However, if you can synchronize one with the ballista, you can add a second one. I have a couple of crazy ideas:D although, originally, I planned to give the mage a teleport spell in case the ballista gets suddenly blocked. In principle, this will greatly increase the importance of the mage, and the spell can also be used in attack.

The ballista on the fourth tier looks pathetic. It should be a higher tier. On the sixth, by the way, there are no archers at all, so it will look good there.

The retraining chain must be observed; it already looks strange, and with the pinnacle of evolution in the form of a dwarven ballista, eyes will start to bleed, and rivers will flow backward