I finally got the water tanks cleaned, closed up, plumbed, and ready to be attached to the rest of the boat.
 
With the centre tanks, I had to make new baffles, so I started with a sheet of 1/8 inch aluminum and traced the baffles from the other side.
   
I cut and riveted on the braceing pieces.  I used a potable epoxy to put nuts in the end of pipes.

Then I installed them:

I then added new gasket material.  A food grade gasket material.  I got thick gasket material to help seal the lids.  1/8".  ...
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