Well I have my 2wd 95 f150 reg cab long box and the bed is beat up and would need to be replaced or new complete sides.
I had the thought of doing a flatbed on it but my intention are to build it as a play truck (to take the place of the 73 mustang I had)
I'm not sure how it would look on a truck of the OBS. I would want the wood floor and somethin for wooden side rails but not sure.

I know it looks good on the older body styles. My thought was a deck might be easier the replacing the bed.

This is what kinda got me thinking about it but I'm not a fan on how he did the side skirts...I think I'd rather sit the deck just above the frame and have rounded wheel humps ontop out of some checker plate or something

 

found another one for example...