Final update: opted to go for the Synergy CL-44.4 sump. Unfortunate that I'll still have to wait a little over a month for delivery, but I can at least get the tank stand put together, tap the aluminum for mounts, place the aquarium, and start aquascaping. It may also be blasphemous, but I got it in the "right-to-left" flow configuration since my return pumps will be closer to the equipment cabinet that way.
looks like we'll be sump siblings! (Not twins, though, since I know yours is the SK-44.)