The rubber floor mats arrived. I cut 2" off the 2'x3' mats so they'd fit in the closet:
I laid down the 3'x5' mat under the stairs and took the remnants from the closet pieces to use as a support the ATO (That round thing in the upper-right corner is the automated emergency sump-pump).
PLUMBING UPDATE: I'm challenged to prioritize/visualize which aspect of the plumbing to tackle first. I feel the need to have the whole system laid out before cutting a single pipe.
RETURN FROM SUMP TO DRAIN: Originally, my priority was to layout all the drain-line plumbing. Then, I realized that the display's return pump could also serve the dual-purpose of draining the sump for water changes. The return-line is closed during water changes, so I could simply redirect the return pumps flow from the display to the drain. This would eliminate the need for a dedicated pump for water changes.
This has a cascading effect, as it impacts return-line plumbing to the display. It brings into question the intentions for the manifold over the sump (reactors, U/V filter, spare lines, and possibly the chiller). Ultimately, I'm left trying to plan ahead for all possibilities of what might be attached to the system.
My head's spinning. Many possibilities, many considerations ...this is going to take some time!
What's attached to your display?