This Spring I bought a 2.5" Tower used and installed it on my kegerator. I wanted a second faucet so I read about some projects here and squeezed it in.
edit: Thread i used when adding the second faucet. http://www.homebrewtalk.com/f51/2-faucets-2-5-draft-tower-313516/
edit: Instead of two 90 degree shanks I used one of these for the second shank. http://www.chicompany.net/index.php?main_page=product_info&products_id=1758
Last week I realized I could fit a 22" keg unto the bump in the back of my kegerator so of course I needed a third faucet.
I bought a used wine fridge, installed a temp controller, frosted the glass myself, painted the tower white and added the second faucet and added the caster wheels.
To extend the tower I bought a 2-1/2" exhaust connecter for $3.50 at the local autoparts store. To cap the extension I bought a 2-3/8" Fence post cap. I drilled all the required holes then primed and painted with white appliance paint. I used self tapping screws to attach my homemade adapter to the existing tower. I've attached some pictures. If you have any questions let me know.