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You might be lucky on that! I mounted a model of the ISS recently (revel one) and there are a lot of problems with the solar arrays joints... so I might be able to give some help, I would also like to modify the Columbus module adding the SOLAR external experiment ;). For the solar arrays given the length of those, my idea is to build the frames only, in order to fill the arrays with paper instead of plastic, this will reduce the weight and allow you to put some nice and colorful paper on it ;).