Sorry to stick the old oar back in here, but hasn't the High School already been approached for input here? I only know of this through my contacts in the Scottish Arts Council.

I'm sure if you ACTUALLY spoke to the departments involved (Art, Music, Drama and Sports - yup this goes deeper than just music) you might get some feedback.

Don't be fobbed off now. Make sure that if they do use the School for an Arts Centre it is exactly what you want it to be. It would be a pity to have great rehearsal space without a suitable hall in which to perform.