I'd like to build a hot rod ala Magnus Walker. I don't want to "ruin" an S or an E, and would like to start with a cheaper tub. Maybe a T, if rough. But a 912 would be perfect. I have a 2.7L collecting dust in my garage. Other than the engine mounts, are any other mods to the tub needed just to get the car up to a 911 configuration?