I had a chance to swing by and frame out my stand today. I used the basic design of the rocket engineer plans, originally posted on the reef central forum.
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https://www.reefcentral.com/forums/showthread.php?threadid=1169964)
However, I eliminated the 4 non-load bearing 2x4 screw strips, as my plywood sheathing which will be applied next will perform their purpose. This modification was to increase the footprint of the inside of the stand, and allow for easier fitment of my 20L sump. For the meantime, I have 4 ct. 3” stainless steel construction screws attaching the legs to each corner. These stainless steel screws were used all throughout to eliminate corrosion concerns, except 2 spots where I hit another toenailed screw, and supplemented a 2.5” coated deck screw instead.
Separately, I will be lighting the tank with 2 AI primes. I chose the rigid mounts because they will hold a steady position, even if bumped into, enhancing stability of tank conditions compared to a gooseneck which might need to be finessed.