Thank you for looking and offering advice.
Rain is not a concern as I live in quite an arid region ... it's the strong winds that concern me ... winds of 50 mph are somewhat common ... I fear the wind could rip the tin off.
That's a better idea on the slope of the nesting boxes ... I address the problem of them roosting on the nesting boxes by putting some scrap chicken wire on top but I like your idea better.
Regarding the ability to move the coop ... that is interesting. I used the 4 ea 2x6's at the bottom and 1 ea 2x6 at the top to allow me to span the gap with the 6' fence pickets. It's all screwed together with 3" screws ... I believe it would withstand moving ... however I don't know how to move it ??? I can only think of using one of these wrecker trucks with a flat bed ... I could put chain around the coop and the wrecker could pull it onto the bed. There are also a lot of farm trailers in my area and there is a fork lift at the feed store ... I think it's possible to use the lift to get it on a trailer.
But I've really thought that it would remain there as a sample. But that's $350 of my dollars tied up plus any customer may likely want the coop immediately.
Then my next sample could be built better incorporating your ideas ... plus the roof should be slanting from front to rear ... another mistake.
I'm also thinking of adding a small run to this coop and as I have a friend with an incubator I'm saving eggs now ... I could stock this coop with about a dozen chicks ... just seems the whole package might be more appealing to any potential customer.