Things I have learned so far, when trying to do larger amounts of sprouts on the frugal side..

• Yes, you can use leftover window screen in a tray to grow in, but the sprouts will grow right out the bottom but are surprising easy to roll off in, they don’t stick, On the other hand, thick plastic which is so close to what others recommend does not drain well enough and will cause mold..
• Soak your grains for the full 24 hours, not the eight to 12 they say,, it will work fine in warm weather or a hot house but if you are dealing with cooler temps, they need the full 24 hours in the water.
• DO NOT! overload the tray’s, you will just stunt the growth on the whole batch, while you don’t want it spread to thin, as it becomes quite difficult to keep it evenly moist but don’t go to thick either.
• Worry more about cleaning your equipment between batches, mold is your enemy even more then drying out is.. when you clean out your bucket, trays, in whatever form you are using, make sure they get a good scrub out and then a full bleach out rince and air dry before use
• If at all possable buy cleaned seed, I had the chance to use from the field direct from the farmer seed, and while it looks good, I have had so many issues with mold on the seed, while the 90 pds of whole cleaned barley seed for 20 dollars has been wonderful in not getting mold issues.  (I also stepped up my cleaning process but I think the difference is far more then that)
• Everyone that has been offered it snaps it up and seems to really like it. I have certainly not yet gotten it figured out that I am getting the levels they say online.. they say 2 pds for 12 to 14 pds of green fodder..
• The best I am getting at the moment is right around 8pds give or take an ounce or two per two pds of grains, not bad, but not quite were I want to be..
• Lower temps effects how long it takes the grains to sprout to the size you want, I am guility of just not waiting long enough, I was! to be on a seven day sprouting cycle and its more like a ten day on, and I am pretty sure I would be getting a better rate of return on the tray’s if I could hold out for a few extra days of grow time.. Which brings my next point!
• This take a goodly amount of space! If you only want to sprout of six chickens, maybe you can get away with a small spot but if you want to use it for a goodly number of critters, you will quickly find that you need alot of space to make this happen, and the really question is where do you put it, you need to do your watering at least 4x a day ideally, and it needs to be able to slowly drip dry, which means you need your trays in a area that collects the water but you can’t leave it there, it will quickly start smelling, I don’t know how folks talk about recycling their water, I should would not want to do so, I have no issues collecting the water and pouring it into the garden or the compost pile or even offered it to the chicken, and they like it very much, so by no means do I recommend putting the water down the sink but it does need to go somewhere
• Last but not least is the advice that using fresh sprouts in the inch to two inch range does seem to also go over very well with the critters, which means if you want, you can mix and match, allowing some tray’s to go longer to the fodder stage and you can allow some tray’s to go to the fully sprouted stay and the pigs at least seem to really enjoy both states, you are not going to get as much feed.
• This does save money, so the piglets are to be currently getting 12 pds of feed per day, you can have a choice here, do you want pay to feed 12 pds of the correctly mixed grains, along with 6 pds of good quality hay per day, or Would you raither take 2 or 3 pds of grains, and create fodder/heavily sprouted grains that turn into 8 to 12 pds of much more nutrional packed fodder with 3 to 4 pds of hay.. If you can find the space and time to sprout, it will cut the overall feeding costs to be sure.
• Rotate your tray’s, the least sprouted on the bottom,the most sprouted on the top of the space, you want the freshest first waterings to start at the top trays and work your way down..

Well, there is my current overview, I am sure as I get things working better and faster, I will tweek  the system and find the ways to make this work better, I do believe that this is well worth it, like most things its got a learning curve is all when you take it from small amounts to much larger amounts and multiply trays on the go at the same time.