I'm working on a piece that needs to use the same instrumentation as a classical-period piece. In the piece, the timpani uses exclusively this G and C.
For my work, I desperately want to use a low E-flat in the timpani part (a major third below the G shown above). It seems reasonable to me that the percussionist could use a 32" and a 29" timpani, which would give me my low E-flat and Mozart his C and G. They could also use a 32" and a 26", right? Is there any reason, other than space in the venue, hassle in moving a larger timpani, or availability, why this wouldn't work?