No - there is one percussionist and one timpanist (two different people!)
As regards percussion (I've been asked by many people about this): there is a drumkit (i.e. snare and bass, high hat, etc). However, I would recommend you notate each part separately, or suggest a beat (i.e. jazz beat, upbeat tempo) I'm sure the percussionist would be able to handle that. We have more or less the usual percussion instruments (triangle, woodblock, tambourine etc). We've actually come across a large single cymbal that when hit, sounds very much like a gong (it's really, really cool
). Maybe you might be interested in using that? We have chimes, though I think it's only those small ones and there's a range of around middle C to the C above that. They can be used to great affect in atmospheric sections.
I've asked around here and am glad to say, you can
add a pianist to your score. But please, don't take this opportunity to make it a piano concerto! Thanks!
Also, I'm truly amazed at how quickly this competition has taken off. I was only expecting a trickle of interest. But sure, keep the word posted around.