worms for chicken feed

Hello fellow composters,
I am very interested in started a large-scale vermicomposting project with the main goal of offsetting the feed costs (and reliance on bagged feed, etc) for our laying flock (~200 chickens and a handful of ducks). Does anyone know anything? Any resources or ideas you can throw my way are very welcome!!

Here's my idea: Our farm also has a goat herd who produce an amazing amount of soiled hay, mostly from bedding in the barn. Historically, this has been collected into loose piles to let age in the pasture for a season or two, and then used to amend the garden. I would like to add another step to that particular food chain and raise worms with the manure-hay to feed to the birds.

Rather than making bins, I'd like to use circles of wire fence mesh to make compost piles. But instead of my usual goal of making the compost hot, I would be building these piles to be ideal for compost worms to thrive. I'm wondering if I will need to pre-compost the manure-hay so it wont heat up too much? And another thing, is it better to fill the bins in increments? Or can I just layer in some shovels of "seed" compost with the manure but fill it all at once? Then, once the piles have sat for the critical amount of time, the whole thing could be knocked over for the chickens to rummage. I would sift out some castings for the garden, and use the rest to start the next pile. I'd need a bunch of these running at the same time to keep a more continuous source of food, but I am not sure how many, yet... nor how long it would reasonably take for the worms to be fruitful and multiply.

If this works reasonably well, I can't imagine ever running out of material to feed the compost to feed the worms. It sounds too good to be true... is it?