Re: On making holes and reducing the number of surfaces.
The combine function is doing its best but it's not possible to have a single surface which includes the hole. (well, it might be possible to duplicate the shape with a single polygon with duplicate vertices but it's not advisable)
The minimum you can have is two surfaces for that shape. Perhaps a rectangle and a 'C' shape for the top section, but anything similar that makes the shape with two surfaces will be OK - I'd leave it as what you have.
Nice model!
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