Have you seen the price of hybrid twins? Ok so in your opinion it's 1k for the turbo and 1k for the manifold (what turbo and manifold are you buying??? I'm getting a new 67mm dbb turbo for similar money as an example), that's buying QUALITY parts. Take into consideration what you can spend and still be reliable, cast manifold & precision non billet non dbb turbo..... still 600hp easy.
For what was spent on the 500hp hybrid twin supra you could EASILY have had a 500hp single supra. Trust me, if you do the maths on what was possible for that budget it doesn't add up.