I looked at Travis's photos and what he did looks pretty stout, but I would always have some sort of stud under the top rim joist.Warranty is through manufacturer.
This is what I'm doing.
Modding a stock type stand
I have a stock stand for a 180 I'm hoping I can salvage. I can reinforce it no problem, but the height is not giving much clearance for a 55/75. @Fish Tank Travis was it you that added height? I can't find the thread I saw this in. Here's what I'm talking about. Just a 40b but super tight...www.monsterfishkeepers.com
I started thinking about shims and the 4x4 idea worried me. So I started thinking of running a 2x6 for a channel for the stand to sit on then sandwiching it between 2x8s with horizontal bracing. I would get an extra few inches of clearance, but I think I just need to add more brackets then suck up the 4x4 route.
He is using metal clips (ticos). They are very strong but now relying on shear strength of the screws. I would use nails or pan head screws with ticos.
Bugle heads/ drywall screws are not the best (sorry Travis).
Using a tall rim such as 8" will add some shear if every vertical member is nailed or screwed. The best is a diagonal brace or plywood sheathing.
This is all coming from a construction background. I'm not an experienced aquarium stand builder.

