I presume you know what your are getting yourself into by taking on that many birds? So in addition to the housing, will be housing for the various feeds each type of bird will need. But you have barn space for that? But also be aware that the other problems will be accentuated......things like rats, mice and other vermin who will be attracted to the feed.Then there is the issue of litter management....and predator control.....etc.
Anyway, back to your question..........to do what you want to do.......back when, there were generally two options used. One was a large, single house that would have been divided into multiple sections. Say a 20' deep by 30' wide house, divided into 3 10' x 20' sections, with either an outside door to each, or in some cases, an aisle through the middle with double hinged door and you used a push cart to take stuff in and out.
Second option was multiple smaller houses.......say 8' x 8' or 8' x 12' or 10' x 16' houses......and you would have as many of those as you needed to house as many birds as you wanted. This would allow you to pasture or free range your segregated classes of birds in many places, vs. keeping them all in one spot. So basically, it is to figure out what you want to do, then design a system to accomplish it.
The housing is remarkably the same. The attached photo is of a house near where I grew up that is about 16' x 22' and would have housed somewhere near 90 to 100 birds. It needed more ventilation, but note the interior is not much more than what most are using today, scaled up for size. The roosts (ignore the used lumber being stored in there) are above droppings boards. Nest boxes in the dark corners.......a bank of these on both back ends. So basically the same design features we use today.....just more of them.