Music Composers Unite!
Mucho questions :
Would this be scored out(written) so that other musicians can play it?
Would this be a Virtual Instrument(s) arraignments?
How much experience do you have in Orchestration either in "live" musicians or VI?
When you say full Symph...You talking full blown; Brass, Woods, Strings,Percuss?....
Or Chamber, or electric stuff (Dream Theatre)
Are you the sole coordinator for this project, meaning ;Composer, Arraigner,Engineerer,Mixer etc.
How professional are possible client(s)....Do they have $$'s.
Whats the time frame....1 month? 1 yr?
Is a good example of orchestration for Rock would be Metallica w/ San Fran. Symphony, or Deep Purple ;Concerto for Orchestra and Rock (1960's), or more of an accompaniment w/ Strings, and possible Horns ...Unplugged?
I think alot depends on you and your experience.
If this is new, then I would charge fairly less and use it as a learning experience.
Whatever you do.....GET A CONTRACT(written)