What.....Seriously that looks like that stuff Perfecto did a few years ago with some of their setups.....Standpipes in those positions exposed like they are are honestly an accident waiting to happen IMHO.....
I know your messing with me Corey, but to the OP imagine 1 of those stand pipes being snapped or sheared off.....The whole tank will drain within a matter of seconds....Sure some will hit the sump, but roughly 25-30 gallons all over the inside of your stand and floor.....Some might beg to differ that a standard setup has the drains drilled in the bottom of the tank, but think about it.....You have an overflow box surrounding them, that once the water level drops below the top of the overflow box, no more water would escape the tank....
I would cap them off....Are the existing bulkheads there threaded or slip.....If they are threaded I'd buy caps from Lowes or HD and cap them or plug them if slip with some PVC and some glue and caps.....I'd seriously think about building an overflow for either the back or the corners and going that route.....Honestly I think a center overflow either through the bottom of the tank or 1 near the surface would be a better fit....
Doing a little more thinking and not sniffing WeldOn 40 fumes, I'd think the center overflow up around the top of the tank, which exits out the back would be a better fit for this tank vs an overflow box that extends all the way to the bottom of the tank.....My thinking or logic, which always isn't sound is the overflow located around the top would save on space inside the tank and be easier on the eye as well.......