Yes the handles and panel came from a G4 mdd ;-) the original parts of G3 not look good and very old...
For the front fan I tried to take advantage of speaker grill to intake a fresh air.
The case is very silent and the fans run at a minimum rpm when the cpu is in idle or low load, when the cpu is in full load the fans run at full speed and the temperature very rise, i reach 80c for the cpu... but is overclocked at 3800mhz in turbo mode (the cpu is i5 2400)