Looks like Omar at Vader Solutions might have another offer for me (engine sourcing and building). They also convinced me to go single turbo. I've been thinking about it for a while but after speaking with them a bit, I'm sold. IT is badass not to mention the beautiful engine notes that come with a single turbo.
4N produces the ST kits. Might as well since I'm going to be rebuilding!
I'll add updates to the sources and builders and what not to the original post once I have it all together.