Shaping up nicely. I have a similar design; its a 24' x 24" stand with a solid wood top. The 5-Stage RODI filter system is mounted inside the stand and a 40 gallon brute on top for storage.
I also plumbed in my ATO supply from the 40 gallon brute.
Not meaning to burst your bubble, but better than spilling a lot of water. How rigid is your stand? It looks like the four legs are resting on top of the base and held in place with screws. I’m envisioning that the legs would fall over if a strong enough lateral force got to it.