You are correct in that fleet sales like Postal, Utilities and the like will have their own Charging stations. Effectively in the various facilities parking areas. Remember the biggest concern for EV's in China right now is not over-stressing the grid. All these fleet people have to do is just set a timer to activate the plugs during low peak hours. For that reason, these fleet orders come with a plug and are sold with the battery. I can't say for sure, but I don't think they have the quick change feature.
Yes, these sales, IMO, will most likely be where most of the first 50,000 or so sales will come and that is the reason Mr. Hu needed to get automation installed so quickly. But don't underestimate retail sales. Particularly in Jinhua. Remember, so far only the first 3000 cars have the $3000 subsidy making the total cost to the consumer around $3000. If there aren't 3000 people in Jinhua that can't afford that small amount of cash, then the big EV companies really will be toast.
As par as sales in Jinhua, the Company is handling those internally, both retail and fleet. They have a fine showroom and a test track. I would also think they would have at least one two locations in the city, manned by Company employees, though I don't know this for sure.
In areas outside of Jinhua, I know they are building a dealer network. Here is a link to their dealer site. For some reason the links don't seem to be working on my computer, except for the little black "login" link top center left. When I last looked at this site a month or so ago the links were working and the link to the right on the drape was a page that had Dealer requirements.