I'm not sure why you rearranged the panels.  
I found that getting rivets larger than 3.2mm hard to pull down with a hand rivetter. So I bought an air rivetter like this: 
YouTube  (I bought a cheap Chinese one, not Kinchrome.)
Ahh, what a difference.  Perfect every time - providing you don't accidentally touch the trigger before you are ready.  
 
I've been thinking of putting my solar panels in drawer slides under the Pioneer Platform so they can be slid out when stopped.  I saw this on a bloke's Toyota.  Putting the panels on top would mean, for me, losing too much load area.  A spare wheel takes up a lot of space** (and it's heavy)!    Admittedly, I'm not sure that drawer slides would survive corrugated roads for too long. 
The Deutsch DTP is a good choice.  I do like their connectors.
** The spare goes on top because when the drawers are in, access to the spare is impossible as it's loaded from inside the car, it's not underneath.
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