Hi Oliver, Merry Christmas to you as well!
But for the UV map size question, sorry no there isn't any connection between model size and UV map size. The UV coordinates MoI exports are pretty basic, every face in the model has UV coordinates between 0 and 1. These coordinates are not pixel coordinates though, they're coordinates in an abstract unit square representing the texture map width and height without any specific pixel coordinates. Pixels only come into play when you assign an actual texture bitmap to something later on.
But if the default UV coordinates that MoI is exporting is causing a problem in 3D Coat and you're going to need to make a new UV mapping anyway you could just turn off the UV coordinate export by a setting in moi.ini , go to Options > General > "Edit .ini file" button. Then go to the [OBJ Export] section and find this line:
[OBJ Export]
<...>
WriteTextureCoordinates=y
<...>
And change that to say WriteTextureCoordinates=n instead.
Hope that will help!
- Michael
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