Sump& Plumbing design for shallow 18g, 36x12x10 Display Tank

Officially coming down the home stretch on my shallow tank design/concept and am looking for help on a sump design.

I know this post is a bit lengthy, and I apologize, but I want to make sure I get this all worked out before I move forward.

The display tank will be 36x12x10 (approx 18g). This will be setup an my office at work, so I need it to be as quite as possible. I don't have a cabinet for the sump to sit in so it would have to sit on the carpet under the table that will hold the tank. Any problems with doing this?

As far as sump design, I was thinking a 10g sump would work. Does that sound accurate?

The next thing I need help with is the pump:

From what I've read, I believe you are suppose to turn the total system volume over 5x per hour. That being the case, I believe I would need a pump that is rated for over 140gph ([18g+10g]*5). I know the 10g sump won't be completely filled, but if I account for it I should be OK with a 140gph pump right?

The last thing I need help with is the plumbing:

I'm going to be honest and say that I know nothing about plumbing, lol. I know that my desk/table that the tank will sit on is about 3ft high. Knowing that, and everything above, what size PVC pipe should I use? Also, what size bulkheads?

I was planning on using an overflow kit from glass-holes. I was thinking either the nano overflow kit or the Super Nano con Dientes. Any suggestions?

Thanks in advance for any and all help. It truly is appreciated.

 

Put something together in Paint just now. Not great quality but you get the general layout.