i would have gotten rid of the rear fan grill, simply unneeded, your fingers won't get hurt if you reach back there. (just what is the rear fan cooling anyways? your dvd drive? can you get rid of that fan? maybe save like 2-3 watts right there)
Yup - in fact I have removed the entire fan. Arguably it cools the DC-DC board (which is mounted above the optical drive) but
1) Not sure how much cooling the board actually needs - even at peak load (93W at the wall) to cause an argument if the AC-DC brick is 85% efficient there is 79W going in to the DC-DC board, and if it is 90% efficient it is only dissipating 8W which isn't great but is approaching trivial as long as it has some access to open air (IMHO)
2) As you can see from the front view the cable loom pretty much 'seals' the front of the lower compartment and so I am not convinced the rear/lower fan can even get much air across the DC-DC board - most of it will just blow straight back out the back. As you note any air it does move is most likely to bounce off the back of the DVD drive - the coolest SATA connector is hardly a design objective!
The only surprise here being that someone actually bought one of those things
Hey - I like it, but appreciate not everyone will!
And i would have used a slimline DVD drive.
Not sure it would be a big gain - would leave more air around the DC-DC board which will help its cooling but no real way to use the space.