Uncle, i love your pictures, and your tank setup here at the end.
just a suggestion, if you dont like your return pump being behind the top off container, you should shorten the PVC nipple between the bulkhead and the Ball valve. then the 45 that tilts the plumbing to the back of the tank, just twist it it to the right, and the other 45 that takes it vertical, just twist it to match. that will tilt the plumbing back, and jog it to the right so it will line up with the plumbing on the top side.
but if it doesnt bother you, or enterfear, then cool.
also, are you going to run a Kalk or CA reactor with your tank? (i havent read to see what kind of tank your planning on running. LPS, Softy, SPS.
or are you going to run a doser and 3 part?
that would be sweet to see for a drawing as well....