62 GMC in need of some ideas and help!

[CanadianGMC]

Hey everyone, since my last post here my truck has taken on quite a different shape:



Sorry about the big pictures, I don't know how to resize them all to the proper size without doing all 170ish pictures individually...

Anyway, I have 2 questions for everyone. First, I'm looking into getting a tonneau cover for the box, but I need to know, do the box railing holes need to be in place for support? I'm thinking of filling them in...Also would it be possible to find a hinged cover that does not have the inner latches as I would like to put seat belt buckles in to open the tailgate.



My second questions is what do I need to do on the frame so that I may be able to fit a gas tank under the bed instead of in the cab? I do not want to cut the frame up too much, unless I absolutely need to.



Thanks everyone!
-Adam