Guide on adding a new model, animation, and creature to HoMMV

I didn't do any smoothing; I just changed the object type from editable poly to another one (editable mesh).

In the simplified version of the tower, the vertices at the top are not connected, resulting in a circular hole, and some polygons are not displayed due to the unwrapping there.

Yeah, there are definitely some flaws =)
I tried to simplify it as much as possible, and probably didn't connect everything properly in the low-poly model.
Also, the texture wasn't baked very well, which was partly due to the UV mapping (the cut on the back of the dome). Ideally, it would be good to clean up the patched areas somehow in Photoshop.

But until I figure out how to preserve smooth shading during export, all this isn't critical. Angular models don't suit me; I need smooth ones =)
I wouldn't want to download 3ds Max again (I used to try it, and Maya too, but frankly, they're both rubbish compared to Blender, but that's just my IMHO).