1) Fill planters up using jugs first. To fill them, stand on one corner facing the diagonal corner, squat, and look down then dump jug. This way you can get all 4k into that one planter. Do this wrong and you can get a lot less water in it.

2) You can set barrels on the roof or use pumps, either work fine to deliver water. I have 4 Large Water catchers outside (2 actually under grills and they still seem to work). I have them all connected then pump constantly running to the barrels. [BUG] The big issue is the flow of water from Large water catchers is 6, not the 12 it shows, only 6 ml move through the pump even though it shows 12. It looks like 24ml move using gravity between barrels on same level.

3) I saw a video showing to only use 3 sprinklers over the intersection of 4 large planters. This was ok, but I went one better. Place large planters in a 2x3 matrix, on either side of the middle 2, add one more so you have 4 across the middle and 2 above and below. The lay it is like a plus sign with 2, 4, 2.

Place the 3 sprinklers above the exact middle. With the splash over, water hits all the 2x3 fine, the 2 on the sides get some but should be watched. I only splash more water into the sides when they get below 7k.

Update: This is the best one I have found so far, 18 planters in 3 groups of 6, I place 1/3 wall between the groups to prevent splashover. 8 lights, 6 sprinklers, 6 heaters if needed:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2387118820

4) Set the sprinklers on a timer. I have a timer loop that turns the power to the pump on a minute and off a minute. This watered 50% of the time. I wanted less, so I added a timer into the power line to the pump. So even though the pump is triggered on, I control the power in, currently at 20 seconds of the minute the pump is on. I split the trigger signal going to the pump to also trigger on this new timer providing pump power. This can easily be changed up to the full 60 seconds if needed.

I have found running this way, sprinklers running roughly 16% of the time, keeps the planters fine. I occasionally trigger the pump power timer on again a few times to push extra water or splash with jugs in the intersection of the platers to spread it amongst them.

5) Fertilizer is easy to come by if you just pick up after horses. Add that, it is used slowly.

6) Ceiling lights can also be spaced out, thanks Q. Put one above the middle of the intersection of 2 planters. Some time I may try the 4 corners, but in the plus shaped layout, 4 work well. I use windmill and a large battery. Power isn't an issue then.

7) You can mix other types of plants together but I would only do this when just growing food. Also, only use one gene set for each plant to make sure it doesn't cross-breed before producing. This will let you pick some clones still if you need more.

Here is a way to limit wasting water. The long timer resets the short one. The short timer is how long the water will run. A long timer of 3 minutes and short of 45 would mean that within every 3 minutes, a 45 second run of the sprinklers will occur.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2091144306