"shinkan" hey chrisbrobs i see you've playing with 3d in construct for some time now, so i have some questions to ask you (i'm to lazy to test it)
Is pivot point of 3d model considered when rotating around 3d object in construct?
Just make sure you centre (camera) everything before you export the model
Animating 3d object will import animated or just the first frame?
Only one single frame model, but you can simulate animations with slightly different models or use animated textures with the new texture plugin.
Did you found any good number for polycount and texture size to not overkill construct?
Dont know what the max polycount is, but i would say anything over 2000 Facets is too much. with the model scaled to 2.0, and a texture of 256x256 max.
How many models can you import before your PC die?
Dont know, not tested it.
To be honest, i am not an expert, so these guides are only based on the 3d software i use.