You can bring in your old tank and I can drill it hear in the shop, cut your baffle plates, seal it up, with aquarium sealent, the whole nine yards. It is much cheaper to make your own as opposed to buying one....a lot cheaper. With some of the designs on the sumps out there...let's just say there is a lot of unnecessary parts and inefficiencies to them. As far as that center upright goes don't cut it out, just pop it loose long enough to get a tank in there and put it back. Think back to the old wrought iron stands, they work with no center support. I built enormous racks here in the shop, that contain 40+ aquariums, and the load is all in the corners. Either way you could always use a little ingenuity and make a temporary brace that would be out of your way and hold it for a short period. A 2x4 notched and cut at angle would work fine. Either way I do have a couple of sumps in house or I can make you one.