We bought some tin nest boxes to put into a tractor. Now Im wondering... I saw some designs to make nest boxes where the egg will roll out into a chute/tray thingy so you dont have to open up the boxes to get them (like the commercial guys do it) Anybody know where there are some practical, (somewhat) cheap, designs to build or modify nest boxes like this? thanks! PS. it would be for about 100 chickens per tractor, so how many boxes?