Here you go, 1st one is the tank view.
2nd one show valve under the drain pan.
3rd one show the center slat stand covering the drain to prevent some trash from enter the system.
4th just shows some cut parts and the slats.
If I did it again, I wouldn’t use the left ball valve I’d just plug it knowing now it drains fast enough with just the right one and the ball valve under the drain pan you wouldn’t need that either, just closing off the drain ball valves in the tank work good enough for preventing the fluid from returning to the tank.
Hope this helps.