Absolutely hate uniseals in larger sizes! When I did mine the pump I had required 1 1/2" plumbing. the uniseals always leaked. I tried everything to get them not to leak, even replaced them several times thinking maybe I just wasn't getting it right. I switched to shedule 80 bulkheads. The gasket is thick enough, and the brute is thin enough you can squeeze it enough so they will never leak. I switched about 2 years back, and have not had a leak since.Right now I'm planning on building a nearly identical setup. Was thinking about building the stand the same way but I wasn't sure if it would work out until I saw your pictures. Thank you for sharing. I am a little bit concerned about using the brute cans. Have you had problems with the UniSeals leaking?
On smaller diameter pipe, an harder sided containers(unlike the brute which is rather flimsy) uniseals work great.
Might even be a pic of my setup earlier in this thread. There are several mixing station threads, not sure which ones I've posted in.