Woawww ! quite a lot of work you've done ! Have you heard on MSDS company who makes the racing manifold for mazda skyactiv engines , maybe you could copy this kind of design but attaching the turbo flange on it ?.
There's also thread on Orange Virus tuning web about boosting our mazda skyactiv engine https://www.ovtuned.com/pages/turbocharging-your-n-a .
There's also thread on Orange Virus tuning web about boosting our mazda skyactiv engine https://www.ovtuned.com/pages/turbocharging-your-n-a .