Update received on 7th of September, completely forgot to post it here:
"We are currently in the process of installing and test fitting what we hope to be our last RHD twin turbo system exhaust manifold prototype. We are performing a full twin turbo system installation on our shop 370Z, which currently utilizing the RHD steering assembly components you’ve provided. This will allow us to ensure that fitment is top-notch and there are no clearance issues anywhere within the system. As soon as installation has been verified, we can begin the molding/casting process for RHD twin turbo system exhaust manifold production units."