I'm with Tim and Jay too. Sounds like the perfect solution.

Maybe you can source just those aisle posts from someone else. You're going to need plates that are longer than 16' for the plates too (for the scarfs). I would consider adding a bent, because your tie beam and joist sizes are going to be huge at ~16' on center.

I've never heard anything negative about queen post trusses. I much prefer them for simplicity in cutting and assembly over king posts.