No need for WAIC - He's not running a turbo engine. He shouldn't need to do any crazy tuning to run an NA 2.5RS or even a 2.2. They're pretty bullet proof and reliable, especially if he runs the cats and such.

It's important to be aware of costs, but no need to overthink either. Brake pads and rotors can be done at anytime, and his driving experience is limited so used parts should be fine for now and upgraded as his skill progresses.

I think you've got a pretty dialed list of what you need. Something else to keep in mind: The kit is AT LEAST 10 weeks out to delivery and such. So you have time to save, save, save in the meantime and get your donor parts handled. Also... the car can be a long-ish term project. No need to finish it overnight. Get as far as you can on your budget, and then keep going as money allows! Also... recoup some cash from the donor car parts. Taking the donor apart will teach you a ton! Don't be a part breaker, use online resources and learn how things are disassembled and reassembled correctly.

YOU GOT THIS! Now order your dream car already damnit!