I have not read everything on that matter but as a SciFi fan the topic is nearly impossible to escape. I took a brief look into the blog and what's troubling me is that there are some people actually getting paid for their work on the film. Well, I don't say that such a movie does not require any money. There are expenses like rent, materials for prop building, equipment, software et cetera. Expense allowances are OK with me (wood and paint for set building, entrance fees at conventions, parking tickets and such). However, getting a salaire goes beyond what could be called a "labour of love". That's engagement.
Just imagine, I would do the same and start a campaign to make a new model. I would calculate 10 bucks for each hour of work on designing, preparation, test build and instructions, a buck for each printed page during the test phase and some bucks for energy. Hum... Intriguing. I could do that, but why don't I? Because my things are a hobby, a fan product, a labour of love. I have fun doing them, I don't want to get paid for that, and moreover, I am not allowed to get paid for it because I have no rights on most of the subjects I'm dealing with. As soon as I begin charging money for it (even if it is a "service" such as delivering a printed kit or asking for a donation to compensate for the costs and time involved in the making), I would be in major trouble and leave the grey area of fan art.
In addition, I'm in no way so strictly organized that I would be able to release a new model every week (which would also cross that thin line between fan art and industrial production).
So I guess that this is the main complaint by CBS. The whole endeavour is organized like one of the big studios.