Welcome to the forum!
I believe I speak for others as well in saying we would love to see some pics of the new project!
Doing a rebuild/restore can take quite a bit of work, but it's also pretty rewarding.
As you're running a dohc with the cv carbs, the factory airbox is really the only safe way to go. That being said, I can guarantee your carbs will still benefit from a good teardown and cleaning. An illustrated how-to can be found on this forum.
If you're looking for new parts, I have a ton in my garage that I've been needing to get rid of. I know I at least have a full front end off of a cb900 (beefier stance and air suspension) and a spare factory airbox that I would be willing to part with.
Feel free to ask questions, too. I've asked my share of stupid ones and always get helpful responses.