does anyone know where i can find instructions on how to build a reusable or interchangeable cakecake stand? thanks in advance!

I just googled "building a cupcake stand" and these are just a few of the sites that came up:

http://www.ehow.com/how_5045397_build-cupcake-stand-less.html

http://www.oncewed.com/7598/diy/diy-wedding-cupcake-stand/

http://www.cakejournal.com/archives/how-to-make-a-cake-stand-for-cupcakes-or-mini-cakes

http://www.k-boutique.com/cupcake_stand.pdf

Not sure if they're what you're looking for, but it's a place to start.