Which sump is that? Looks nice! I am in the equipment purchasing stage of my 60 Cube build. I bought a used tank from a local reefer that came with a 24" sump. But it doesn't fit under the the current stand completely (hangs out the back a bit). So i either need to buy a sump designed for a cube, or rebuild the stand to a similar size like the OP did to fit the 24 inch sump.I was really bummed as I was planning a 60g cube build earlier this year. My local petcos did not have the 60g aqueon on sale (they were excluded), so I took the plunge and just ordered a custom planet (with low iron). Significantly more expensive and I found on that recently they started including the 60g on the half off sale...
Regardless, I ended up roughly in the same spot as you although at a higher cost lol. Love your looking stand, looks gorgeous. Here is mine
Just finished leak testing this weekend