Had this idea a few months ago actually. As fun as it sounded I don't think I could personally pull it off lol.
I agree with everything Wills and Colin have already said.
As far as your intended stock goes, I would give the BNP a miss. I'm a little wary housing different species of plecos together - especially if one is larger than the other or has been in the tank longer than the other - as they can be somewhat territorial. I've known my sailfin to chase the common I had around the tank a lot, leading me to move the latter from my community tank into a different tank for a while.
Otocinclus and plecs would probably fight with the plecos over food supply, as they're both quite rampant algae eaters. The same applies for the corydoras. I would definitely give the otos a miss, and maybe consider one pleco and maybe eight corys. Perhaps one pleco of a small-medium size would be good. You could even opt for a special BNP such as a super-red, albino or longfin if that's your kind of thing.
The colours of the fish in the tank would be quite plain and uniform with little contrast, which Wills has already pointed out. You could consider a flashier pleco such as a false zebra (or zebra, if you have the money and confidence) or some type of snowball. Gold nugget plecs and sunshine plecs would also stand out quite nice in that tank, though these are quite a bit bigger than the clown plec and BNP you were going for originally. There's also an incredible number of corydoras species, so don't limit yourself to pandas if you think there could be a better option for you. My personal favourite are albino c. aeneus and gold laser corys. Gold lasers are a bit more on the expensive side but I'd say it's worth it.
For middle to top dwelling fish I would consider Colombian wood catfish, glass catfish or upside down catfish. In my experience, upside down catfish are pretty boring but can be more active in a larger group. Glass catfish prefer planted aquariums from what I've seen though, so this may not be a good idea with plecos - which just love to uproot all of your plants in one fell swoop.
