Sound like an interesting project.
Not trying to deter you but this is only worthwhile if you want to engage in the build process (i.e. the project itself). If you're looking at it purely from a performance vs cost perspective then you're better off looking elsewhere (Perhaps an ej20 swap).
To do this correctly with the 1.5 would require a bit of work (and expense) - my biggest concern would be the electronics side of things - you'll probably need to run some sort of piggy-back setup to accommodate the turbo setup and to ensure that things run safe.