Are you going to glue the joints? If so, I recently used "Gorilla Glue" on a project and liked it a lot. Make sure you use plenty of clamps and wipe up any excess. It tends to expand a little and ooze out of seams as it cures. Also I would pay a lot of attention to sealing any exposed ends of the plywood. This is where it will start to delaminate first. Several coats of a good polyurethane sealer should provide you with a beautiful, durable finish for years to come. Good luck! Another alternative you might consider is framing up the stand with 2-by stock and making the exterior out of removable panels. You could use thinner plywood if you did this and it could make maintainance much easier in the future.
AquaC Remora Pro
140#s Live Rock from LiveRocks.com
Frogspawn, Hammer, Zoos, Leather Frag, and Xenia and Green Star Polyp frags from fishfreek and Alarmguy66, Thanks!
Member of the Unofficial A-Team