Thank you Hachiroku!!!!
From the several more new pics Hachiroku have taken, I have to say several things.
1. Engine is new Subaru boxer engine FB (not the Toyota helped ver).
2. Tranny is new tranny (prob AISEN).
3. Other parts are all old parts using from other cars.
a. Suspension - STI hatch (can't 100% say for sure on the rear)
b. Brakes - WRX
c. Rear axle - STI
4. No Mata, from the new pics, there's plenty of space under to put turbo exhaust header. If there's a space for oil pan under, there's a 100% sure exhaust header space for it.
5. Yes, timing chain Phant. Subie have been using chain on several new engines for a while
6. Tire spec is 215/45/17 which is pretty common tire spec for that hp/tq cars.
7. From the tire spec & wheel spec, it's possible that bolt pattern can be 5x100 instead of 5x114.3. iirc 5x100 is 17x7.5 vs 5x114 is 17x8, so 215/45/17 on 17x8 makes tire thinner, but pics looks nice fit, so my bet is 17x7.5 w 5x100
8. Random pointer, but it's weird to see starter on right side instead of left side.
That's all I can see... for now