i have done a similar thing with the rockers on my rig. i did it first, with supersize75k5's help, to the '83 body i had previously. it is not in any way shape or form even "semi-weather proof". I would come out in the morning and hop in my truck and there would be a huge puddle on the floor. rain water runs down the door, hits the rocker tube and runs into the cab. additionally, you can't do quick release hinge pins cutting up quite that high (ofcourse that doesn't help you now... )
so i did it a bit differently on my '73 body when i did the body swap. i built the following to aid in the weather proofing, plus make it street legal to run without doors in states where doors are required (i.e. washington).
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