[FishyFishy!]

So, the next thing to do it make the rear overflow section water tight. I used some crazy acrylic glue to seal all the parts together, and after for safety I also siliconed the entire inner perimeter.

(warning... don't open the can and stick your nose in to see what it smells like....burnt my lungs in a bad way)




Acrylic weld is seen here -


And now all together with the silicone in place



And bulkheads installed