To my knowledge there was a build log started for the first outside car but that was before the changes to VW/Audi and it didn't make it past disassembly of the eclipse. Fran hasn't posted a build log but hopefully the purchase of the car includes something similarly detailed. Facebook seems to be the place where most updates are posted first by Superlite. To my knowledge the only Apex around is the grey shop car and it likely was built with a 4G63.
I have to agree with you that it is disappointing to not be able to see more and have to make a purchase based on faith (or a plane ticket). But I'm sure the details will be posted when it's available. That being said there isn't a whole lot available from the company for any of their offerings in the way of detailed pictures or videos (when compared to an obvious "competitor"). Yes plenty of people have posted GT40 and SLC build logs so you have the chance to see them in detail as we would like to see the APEX. I'm not sure we will see much more until people take delivery and build logs start (nobody has posted expected shipment dates either). In the end I'd rather have a well engineered, low production, high quality, and poorly advertised car then a poorly engineered, high production, low quality, well advertised car (like said competitor)...so we wait.
Hands down I'd be building the GTR if it were an option.