All vented hoods run the chance of water getting inside the engine bay. However, no harm is or can be done. Seibon's TS Style hood is their #1 selling vented hood design, next to the OEM style hoods.
The hatch and spoiler are factory replacements. They are not stick-on.. this is Seibon
Still awaiting information, pricing, availability from Seibon regarding these two items, as well as those fenders.
Check back often, I'll post updates, and update the OP as well.
-AJ