Yeah that's me. I'm not to vocal here unless I think I can help or think someone can help me.
The firewall and coolant lines are fine. Obviously you need to make yourself new lines to the turbo because of the location. The gate isn't to big to have a problem as far as I know. Maybe if you ran a larger sized gate then the tial you might have some issues.
I'm not sure on the recirculation of the gate. Not sure if it is even nessary or if you can get away with just venting it. Also I wonder how loud it would be.
When I get the setup together sam at costal will be dyno tuning it and hopefully it will make some impressive numbers.