No definitive timeline exists. The zoo realizes that this will take some time. However, once we have the tank, we can get things cranking: building the stand, canopy, plumbing, closed loop etc. I would love to shoot for mid to late July so that the zoo can benefit for a few months before it closes for the season. Earlier would be great of course but we shouldn't stress over this project.
If anyone wants, I could post a sample letter. The main things to include are the nature and goals of the project, the fact that the zoo is a non-profit organization with limited discretionary funds, and that plaques honoring primary corporate and other sponsors can be displayed.