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Putting the cover back on is just as easy; just reverse the procedure, starting with putting the bottom groove of the cover in place. The fit is a bit sloppy but smooth, because all the mating edges have been folded over -- to eliminate the potential for cuts and to make everything fit smoothly. It works.
Here's what you see when you open the cover.
Though we lack a micrometer to measure thickness, the sheet metal is hefty enough, on par with case offerings from Antec. The 9 square holes for ATX motherboard mounting are visible in the above photo. Clip-on metal risers are supplied; standard screws are then used to secure the motherboard to the risers. A number of brass threaded risers are also supplied, presumably for use with smaller or nonstandard boards.
The same nicely open square hole pattern on the back fan grill is also used for the bottom front fan grill . It can accommodate a 92mm fan. There's also a strip of additional holes beside the fan grill.
The area directly behind the front fan is completely clear, except for the green plastic retention device for extra long PCI cards (rare in home PC systems). This is a very useful "feature" for PC silencers: The front bottom area is a perfect spot for hard drives -- mounted in mechanically decoupled cages, suspended from upper drive cages, or even placed bare on soft foam or sorbothane pads. The front intake airflow helps to keep the drive cool; heat can be an issue with mounting techniques that don't secure the drive tightly to the chassis for conduction of heat (and vibration).
The Chenbro web site shows a side open view of the case with an additional drive cage in this area, but there is no mention of it in their description. Perhaps it is available as an option or add-on.
You may be wondering what are those 2 plastic tables along the front corner edge. Well, each is part of a rod, and the tab actually rotates the rod, which moves clips on the front that hold the bezel in place. A simple push on the tabs and the left edge of the bezel bushes away as shown in the animated GIF below. Then a gentle pivot and pull on the bezel and its completely free. Very ingenious and convenient, yet secure. Once removed, the metal work is visible, as shown on the right.
The bezel itself is very transparent to airflow, as suspected earlier. Here's what it looks light against a lit background. The right photo below shows the inside, which is equipped with an airconditioning-type dust filter. The filter is not quite up to Bluefront's standards, but certainly a nice touch, given the openness of the intake grill.
Going back inside... there are four 5.25" drive bays and three 3.5" drive bays. One of the 3.5" drive bays is has front panel access; the other 2 are for hard drives only. The plastic bag visible in the 5.25" drive bays holds a frame for a 120mm fan and hardware bits, mostly for motherboard mounting. It's a fairly typical fan frame that most silencers will chuck, opting instead for damped elastomer plugs or ordinary screws. These fan frames have a tendency to vibrate.
The drives are all fitted with plastic/metal rails, which are neatly tucked away on the bottom center of the case. There are 2 types of rails -- one for optical drives, another for HDDs. No screws are needed. Little plastic nubs friction fit the rails into the drive, which then allow the drive to be slid in from the front. They may even help reduce the amount of vibration transmitted into the case. Very neatly done!
The inside of the back panel is shown below.
Aside from the PSU opening, the exhaust grill and the 92mm fan, there's that mess of green plastic at the bottom. "What is that?" you ask.
Well, that's more evidence of the clever tool-free design that went into this case. Each of the slot covers is fixed in place by a black plastic cylinder that you turn & slide up to release, and slide down & turn to lock down. A little notch on the mating surface between the plastic and the top of the PCI slot or device keeps them aligned. There is enough tension and pressure to keep the card secure. Perhaps a very heavy card could pose a problem in transit, but that's about the only downside we can think of. (This explains the metal cover on the outside of the back panel -- it hides the mechanism here.) Again, very neat, well thought out!
Below are photos of the fan -- a 92mm, 0.25A 12VDC Top Motor brand fan by Dynaeon that's a a bit ticky/buzzy but not too noisy and maybe useful in a pinch -- and the support ledge for the power supply.
So there you have it -- all the components of this interesting case. How does it all go together? Very well thank you.