housing advice wanted...

[amoonswirl]

I have 2 doves and 2 fantail pigeons that I keep as pets. Each pair has its own cage in our parlor right now. I open the cages to let them have supervised exercise in the parlor daily, and this arrangement has worked fine.

However, I may want some more pigeons at some point. 4 is definitely the maximum number of "housepet" birds, for a variety of reasons that I'm sure you can all imagine

I've been trying to think of a good place to keep additional birds. One side of our house has a long, narrow enclosed porch - roughly 20' long by 5' wide. It has a concrete floor, interior vinyl siding and 7 windows that also have screened panels for the summer. The ceiling is peaked and quite high. We're not really using it for anything, and I've been thinking of setting up an aviary back there.

Here are some of my questions:
Is the concrete floor suitable, or would I need to put something down on top of it? If I need to put something down, what should I use?

Would the windows need to be covered, or would the birds learn not to crash into them? If they need covering, what would be the best material to use?

What sort of a coop/house would be the best thing to give them? Or would they even need coops? I could probably let them have most (if not all) of the porch for themselves. And I'd be happy to set up perches and enclosures but I guess I just need to know what they need in order to feel secure.

Is temperature a concern? We live in New England, where we sometimes get extremes. The porch is not heated or cooled, but it is enclosed from wind and rain.

Does the size of the enclosure (20'x5' with approximately 10' ceiling) sound adequate for a few birds? Keep in mind that I would not ever be letting them outside to fly.

And one last thing...
Any advice on cleaning would be appreciated. The porch is directly attached to the house so I'd like to keep it smelling fresh.

This is a long post with lots of questions - thanks in advance fpr reading this far!