Here is a site with some large cage plans.
http://www.albinoburmese.com/cageplans.htm

Thanks for the link!

Great link. I wish I was proficient with hand tools.

When I was going to build my rat rack. I talked to a carpenter. He built my rack for 180 bucks. Holds 12 trays of mice and 9 trays of rats. Some times you can get the expert to do the work as a side project.