Flatbed my Truck?

[Chipper4X4]

Hey board!
Wow I'm glad I found this site. Very informative. I just picked up a tough piece, and need some advice. It's a 1971 c10 4x4. The cab has the usual corner and rocker rust, both fenders are crunched, and the bed is barely hanging on. It's been reinforced alot but it's gotta go away, before it falls off. The truck runs and drives fantastic and the frame is straight, so I figuered it was worth the 900 I paid for it. I will eventually restore it, but lack of funds, will cause a slow project.
Anyway I thought about making a flatbed for it, until I have the money for a decent box. I have a big pile of treated 2x6's and I can get a hold of some angle iron for little to nothing. I can't imagine it would take a whole lot of engineering to build this thing.
My questions are, has anyone done this before with the material I have? What problems have you had? Should I even consider this as an option? Construction pictures would be great! I will be driving this truck daily until I can get the money saved for the resto.

Thanks for your help.