As far as networking, try to make friends with some composers as well. There can be a mutual benefit of friendship there. As Chris said, a lot of composers start out doing free or low key stuff. At that stage, there really isn't the funds to hire an orchestra. However, if you are trying to get the work just like the composer is, perhaps you would offer a little work for free or little money just to get your foot in the door and your resume started. If that composer really likes what you do, they will be more inclined to take you on to future projects if they land them. Not all scores require a full orchestra, so a composer may really benefit from having just a percussionist come in, or only a handful of instrumentalists.
A friend of mine has really been doing great with scoring soundtracks. We worked together on a game soundtrack a few years ago. He started out doing a lot of free work, and now has gotten to the point of scoring for real orchestras in addition to his sequencing. He's starting to do big name stuff and I really expect to see great things from him in the future. He worked very aggressively to get where he's at, and a big part of it was a move to L.A. Lots of competition there though.
Composing soundtracks is something I really want to get into further, so I can really relate to your post. I'm still in the 'do some work for free' stages. I've only done one soundtrack so far, but I have recently hooked up with the same producers for a new game. It's an all volunteer project including the programmers, artists, etc. We're all doing it for the experience and to try and get our names out there. A couple members of the last project went on to big name game companies.
Most of what I'll be doing will be sequenced because I can't hire an orchestra. I've thought about contacting the dean of music at the college I attended to see if I could work something out with him... maybe get the chance to borrow the school's orchestra members (

) and set up in one of their auditoriums with a couple of room mics in exchange for school credit for the students. Instrumentalists are required to perform so many times during the semester. It would be a daunting task though with rehearsals, but it would be a great learning experience. At the very least I'd like to have some real percussion recordings (mainly for a couple of marches I have to compose).