After advice from Satomi and seeing the sticky for ASF tubs, I dove in and made my own. These are 66 qt tubs. Here are the pics:
Bottom side of lid/feed hopper:
http://i1254.photobucket.com/albums/...psdb04c42f.jpg
Top side of lid:
http://i1254.photobucket.com/albums/...psefe900b2.jpg
To secure the sides better, I used binder clips:
http://i1254.photobucket.com/albums/...ps6a64f30b.jpg
Finished product:
http://i1254.photobucket.com/albums/...ps1203097b.jpg
Checking out their new digs:
http://i1254.photobucket.com/albums/...ps708f5847.jpg