The problem is solved. It was a texture that unexplainedly increased the file size after processing (mkz file). Thank you for your assistance.

I do not know how Builder Boy's plugin works (hopefully the same way) but TT also has one - UV Toolkit - where you can paint all front face materials onto back faces and vice versa while keeping UV co-ordinates be them any kind of projection or distorted/twisted etc.

I like Simlab's, they seem to add new features frequently, but I haven't tried any others.

This happened to me once, too. Both rules change as well as the revision is done by humans who may interpret those rules differently. Also, sometimes they let a model that does not fully comply with the expectations through in an area where there are very few models anyway and next time when they see it but there are more models, they may check it more strictly (this is especially true with model complexity). They must have given a reason (you can read at the bottom of the model page). Try to make those changes and re-submit the model.

Also 2048 is still sort of "luxury" as it will be downsampled anyway and/or will not load properly (or at least fast) in GE and all you can see is some kind of smeared bunch of colours. Note that everything needs to be streamed from the servers. If there is a low bandwidth connection, people will simply navigate away when not seeing anything soon.

Thanks for the reply. The example given, as well as all models of the author are very beautiful and were very useful to understand what is intended, with the models for the GE. Tanks Gaieus

Paint.NET is a pretty straightforward, easy to use yet quite powerful freebie. I have more robust apps (like Gimp for instance, which is also free) but I have Paint.NET set as my image editor under Preferences > Applications in SU for quick editing of textures.

It seems that you are using small, tiling textures BUT quite complex modelling (for GE at least). This is not what Google wants however. What they would like to see is that you take a photo of the whole building (or a side) and apply that photo on a whole side of the building without modelling all the openings etc. As for the model approval line; it should not be more than a week or maximum two.