Yes, it has a ball valve, for now. (gate valves are costly for some reason).Tried to download the bottom half of the set up, but couldn't for some reason, It'll try a bit later.

Sump half
 

Lower part of the new set up

Shiny, sure you want to put water and fish crap in there?

Centre pipe, you extending or for filter sock? Thinking if a drain might be a little splashing.

The centre pipe is a emergency overflow, just in case the main drain gets plugged or clogged. A safety feature to keep the tank from over flowing. The spashing, will creat a noise, that will warn me it needs attention.