When I went for the role last year for my HS production--I just asked if I could be the puppeteer. The Director said yes--but I would have to audition if another person applied for the role.
No one did.......but the director also knew I was a puppeteer & had seen my work & it was one of the reasons she chose to do the show.
What I suggest though----is to ask & if you don't already have a portfolio or tape with examples of you puppeteering.....Get one. Make one over the summer. It helps.
We rented our plants from here:
http://www.mcavenedesigns.com/index.html
They are Great to work with & it's true--pod 4 is only 30 pounds!.....It's Great......I was able to move all over the place with those babies....