The September/October 2008 issue of Backwoodsman Magazine included an article about how to make a shotshell reloading setup from scrap wood and a single nail. It actually looked very easy. (At least I'm pretty sure it was September/October, though it could have been November/December.) The issue can be purchased here
for only $5 including shipping.
You may want to call them at 866-820-4387 to make sure that's the correct issue, though. My memory isn't what it was even a year ago. (And I'm still just 23!)
I haven't built one yet because I was living in a one-room apartment at the time, and I didn't have many tools with me, but I think I'll try to build it here in the next month. Your post may just have been the proverbial kick in the pants I needed to get the project done.