That stinks.
Our Sweeney was a high school cast, actually some of the chorus as well as our Toby and Judge were in 7th and 8th grade. Believe it or not it actually worked (aside from some of the chorus parts getting loss).
If you're going do do the show, do the show. We didn't change anything, including all the "split me muff mister, we'll go jig jig a little." It was all there. Mea Culpa was there too. Our judge was in 8th grade (mature for his age, but still) and he was actually great. He could sing Bass just fine.
Well we had a director who liked to challege us. When I was in 9th grade we did West Side Story at my school.
Now my Sweeney is at Tisch, so we know at least he didn't suck:)
I went to a very small private school, not a performing arts school, but they were very supportive of the theater department there. I think as long as you have the right cast, the show can really be done well.
"This ocean runs more dark and deep than you may think you know...I'll be the fear of the fire at sea."
-Marie Christine