I'm just making some brackets out of angle iron (actually using aluminum, but angle aluminum just didn't sound right) two pieces on each side, with the bulkhead sandwiched between them
I'm planning on leaving enough space between them to install some weather stripping on the inside of the brackets to keep rattling noise to a minimum, and to seal out a small portion of the weather. I'm also putting in a strip of aluminum on the bed floor underneath the bulkhead, sealing the gaps underneath it, to give the bulkhead a flat surface to mate up to... (Again, an attempt at keeping at least some of our Oregon rain out of the cab.)
if anyone has any suggestions here I'd love to hear them... I really hate reinventing the wheel, and I haven't started making the brackets yet, so I'm not committed to the plan just yet.