Looking great! Is the vast majority of the background going to be computer generated? If not, we used to use those egg crate light diffusers on the side to create the movie-era Transporter backdrop. They come in 2 x 4 panels and with 8-10 of them, you can make the entire backdrop.
We were lucky at the time -- my dad used to work for a hardware store and managed to get almost an entire palette that were chipped for free. Always like the sets on the cheap -- but it worked great for a backdrop!