The front door on the Trinity is made of plastic, so i guess you can say its kinda flimsy, but it really isnt. The hard drive light is built into the temperature display, which in my opinion, isnt that bad, considering i never look at either of them.
I havent tried to install any fans in it, but it doesnt look too hard. The hard drive trays are kinda close to the window, so i have to bend my cables a lot and it kinda impedes the door going back on, but its manageable. SATA cables are fine though. The tooless design of the drive bays is really nice. Just pop in one of the sliding things onto each side of the drive, and slip it in. Makes it really easy to install everything.