nice work, I duno about the custom manifold, Maybe buying one is hard to come by over there but either way it gets the job done probably at a fraction of the cost...
Iam loving the itb's as well and it should give that 7g a unique sound :) Your external and internal custom parts look pretty cool too but Like everyone else, the Wing has got to go IMO...
Good luck and can't wait to see more pics and a vid of it running :)