I was cringing early on when you cut the boss off the block but you clearly are no cobbler. The throttle body adapter is beautiful. Does it attach to the throttle body with clamps like the OEM style? I originally thought that the inlet was aluminum but I now see that it's aluminum filled nylon. I hope that you don't have any header heat issues with it. It's fascinating what complex shapes can be made by laser sintering. The undercuts in the PAIR plates will tend to be a place for crud to accumulate. I'm suprised that you didn't put them on the underside. However IMO that's a perfect place for carbon/epoxy, which is lighter and won't need the undercuts. But I think that you may need special tools to do them by CNC because it's so abrasive.