CJ, Unfornutately, I know more about horsaes than I want to know. Lil Seaside was into that stuff in a big way when she was in Jr. High/High school, and after. She did hunters and jumpers in the "A" shows locally, across the South and up and down the East coast. My knowledge came at a big price, $, time, etc.
In any case, my point here is that while Hayward is good at what they do, a stable hand needs put his/her stamp of approval on it. They are the ones that make a boarding facility work. The trainers that will work there should have input as well.
The site plan is diagramatic at best. To the best these eyes can see, the 47 stalls are not shown. where are they? At the edge of the main indoor arena like they do up North?
The paddocks should be closer to the stalls, what with rain, time to fetch and retreive them, etc. The paddoks should be double fenced in the alleyways. That is to say the passages to and from the stalls should prevent a loose horse from getting away, and yes they do get loose, particularly when they are being shuffled.
The trailers should have a drive through at the stall area where you can load and unload under a lighted cover, leaving early, coming home late, etc. there needs to be a chute to load them into a large trailer (an 18 wheeler) that commercial haulers use. Some horses just do not like the short steep ramps that come with these things and nobody wants to get into a fight with a horse about loading. Not good. the horse wins every time, even if you get it loaded.
I see a compost pit in the upper right corner. Is this for poop? Poop is the least of the bulk, most of it is bedding. BTW, I assume that the hay and bedding is in the bulk storage area. If you are using shavings, they are best stored in an overhead bin that drops them into the trailer that the stable hands use to haul the shavings to the stalls. Saves a lot of bad backs, keeps it dry, etc.
The arenas need to have a minimum of a tractor path around each one and between them. Mowing, etc.
There needs to be covered storage for jumps, etc.
I assume that there are multiple washers and dryers. Horses, for nekid critters, go through a lot of laundry: leg wraps, towels, sadle pads, etc, etc, etc.
got to have a bunch of hot water to serve the washers and the wash racks. bathing horss takes a LOT of water.
Maybe all of this is included, but in my hasty review, I have some questions.
And by the way: Biggest concerns are fire, drainage and bugs. Fire being # 1 by a long shot. Drainage is almost as bad. Long term, poor drainage ruins horses feet and a horse with bad feet is only good for dog food. Bugs you can fix with a good spray system for a few thousand $.
You asked, I rambled.