If you're leaning towards the plastic tote idea, you can try Home Depot, Lowes, & another store you might find a good selection of boxes to choose from is Harbor Freight. I didn't realize they were such a big chain but apparently they are all over the place. I found a lot of neet stuff to use for airplane tools there along with a very nice hardshell aluminum case for my radios for a lot less money than the radio cases on Tower's site. They had a few different styles to choose from & they all have the eggshell foam in the top of the case & the bottom has 3" thick foam in it that is already perferated into 1/2" squares making it very easy to just pop out the squares you need to make your radio fit like a glove in there. I set it up for 2 radios in just a matter of minutes. So anyone looking for a nice radio case but don't want to pay 40something bucks for it go to Harbor Freight, I got mine for $29 & it is very nice!!
I also found a nice set of T-handled allen wrenches that are color coded & come in a nice little rack that mounts to your flight box.[sm=thumbup.gif]
Beware though, I went in there just to get a radio case, $135 later I walked out, too much good stuff in there. They are on the web too if you want to take a look or find the nearest one to where you live.

Sorry I don't have a link to any plans for you, I saw some in here once but that over a year ago & I couldn't begin to know where they are now.
I do hope you find a tote you like though.

I just checked Harbor Freight's website & they are in Mi too. I didn't see your town listed but you can look on the site to see if any of the stores are within driving range for you or not. If one isn't too far away it might be worth the trip.