Would this work?

[andys1982]

Would this build drain and return?  I've seen similar setups the floor below the display, but not one where the water travels much distance horizontally.  I neglected to label it, but in this proposal, its 15-20 foot distance on the horizontal run.  Let me know your thoughts, Thanks!

[andys1982]

forgot the diagram

[andys1982]

hmm

[buckeyereefer]

all you need is 1/8" per foot of fall horizontal for drain to work.

[andys1982]

In other words to travel 8' horizontal, the intake of the drain needs to be 1" above the drain output?  Thanks for your advice!