Show link to JUN cams snapping please? I deal with them daily, it's the only parts I'd use on the H22 in NA form (cam side).
Best intake the AC? Once again send link. If you're going NA, look at Euro R single runner. It does require some port matching and flow work but been proven to perform (search: Skunk2 vs Euro R manifold)
Manual all the way, agreed

You only save maintenance plan on flash pro products, not their normal ECU's - if you're modding full NA, you not going to get away with just flash pro. PS: Our units are capable of running as high as 10,000rpm.
Suspension, spring rates - spring rates - spring rates. You need the right combo front and rear with the correct shock (compression / rebound). I've done extensive testing on the BB6 chassis - if you're dead serious about getting it right, setup a meeting with me.
Wheels. Just make sure you keep within good offsets, search for wheel offset explained here and read (if you can't find it alert me to check if it was archived).
Brakes. Why cross drilled? Weakens the entire structure for the most part (take a careful look at most racing teams, they run slotted only). If you're looking for a great deal, contact us, we deal Powerbrake products locally, and deal Project Mu and Endless products in terms of Internationals.
Body, Good ideas there, would look neat. Function over form. Always.
Cheers.