In light of Raven's recent injury I have decided not to build feeders into the horse shelter -- I simply can't think of a design that would be safe and practical for that trouble-making mare. They will have to make do with hay nets.
Hay nets are not ideal for a couple of reasons. First, they need to be hung up high to avoid legs getting tangled in the nylon webbing. This forces the animals to eat with their heads and necks in an unnatural position, and hay in contact with the eyes can lead to irritation and infection. Tonka and Raven eat at least 75% of their forage from the feeders so I am not too concerned about these impacts. Second, traditional hay nets (see above) are made of mesh measuring about 6 inches -- lots of hay comes out of the holes, and feet can easily slip into the holes if one is pulled down. It would be just a matter of time for Raven, I'm afraid.
Fine mesh hay nets (above) are gaining popularity in the UK and the USA, but I couldn't find any at our local tack stores or from Canadian online retailers. Last week I bit the bullet (i.e. the plummeting exchange rate and ridiculous cross-border tariffs) and bought two from horseloverz.com. They arrived yesterday, and I rigged them up tonight on breakaway bindings. The horses really have to pull to get hay through the 2 inch mesh, so the darned things bounce around like punching bags. So far Tonka thinks it's fun and Raven thinks it's a pain in the ass.