For Super-Buu, you could use the ones he had on after absorbing picollo, gohan, and goten, and so forth. But this would all take a lot of work, not saying it's impossible, but very improbable. But it is a good suggestion.
Bad idea overall. The models themselves are fine, and i think as mentioned before the only change in model would be the more damage you take (goku for expample) the more ripped up you or your armor looks.