Nice purchase. I'm a big fan of the tune up you're doing and all the attention to detail given.
I'm right now cleaning up and doing a lot of work after my turbo died and noticing some oil starvation so I hope it's not uncouth to comment on a few you may find worthwhile to check while you have things apart (if you haven't already): 1) starter motor: disassemble, clean the bushing dust and relube the actuator (possibly even running new cables) - doing so surprisingly improved starting, 2) replace the alternator belt loop's tensioner pulley (73131FC000) as this failed on my mom's Outback stranding her on HWY63 and started to squeek on my Impreza, 3) banjo bolt filters for the turbo's oil supply line have been known to clog, 4) cleaning and flow testing the injectors with Stefan at PFI in High River, and 5) Killer B oil pickup because I've read the oem one really likes to fail.
I have an extra uncut blue STI key, pm me if you're interested.
Never the less, brilliant project, all the best!