20 years ago, I might have sneered at the idea of corrupting my PC enthusiasm with sheet-metal work. In my youth, I attended a parochial prep school and there were no metal-shop classes.
About 15 years ago, I started doing sheet-metal and other mods on old cases. My greatest project in 2007 involved a Compaq ProLiant 1995 "full-plus" tower case. I wish I still had it. I gave it to a sibling on a whim of impatience for handing down the electronic innards.
Right offhand, I'd say the case shown in your link needs more air intake with less restrictions, but there isn't a picture of the case interior, so I don't know what the existing unmodded potential might be.
But the first thing I myself might do follows this set of steps and parts.
First, I'd cut a hole in the case bottom to fit one or more 120 or 140mm fans (maximum of two fans), and drill the holes for the fan mounts. I would then obtain a piece of perf-steel from a metal shop or from online PC case-modding stores, with dimensions overlapping the exposed fan ports, and I'd pop-rivet the perf-steel to the case bottom before finishing the holes for the fan mounts and adding the fans.
For the fans themselves, I'd steer you toward some Corsair Mag Lev ML120 or ML140 fans (PWM-control) -- the LED option is your choice. Or -- consider the Bitfenix Spectre Pro 140mm LED fans with 3-pin voltage control. Also, for PWM choices, consider the Noctua iPPC 2000 or 3000 models of 140mm, or investigate other Noctua choices of 120 and 140mm.
It is important that you can have motherboard control of any of these fans, because some can be noisier than others. Use rubber or silicon fan mounts wherever you can. You can also mount the fans with cable ties, nylon machine screws and nuts, or anything that offers a possibility of inserting rubber tape or Spire acoustic foam-pad material in the construction to isolate the fan from metal.
SECOND -- (bet you wondered when we'd get to this or anything else) -- buy some braked 2"-to-2.5" double-caster wheels with the 4-screw square mounting plates, use a $10 Sears screw-tapping kit to drill and thread four holes in the case corners, and you now have ventilation from the elevated bottom in addition to mobility for the case.
The caster wheels can be obtained from:
Lawless Hardware in Olney, Illinois
The set of four should cost you less than $20, or they will be something in that range.
If you don't have a rear exhaust fan -- and it will likely require a 120mm x 25mm unit -- consider one of the Noctua fans. I'd prefer one with high throughput, between 70 and 100 CFM.
But you should be able to thermally control all of these fans from the motherboard, unless you pick some add-on fan controller that allows for thermal control from the CPU heat-sensors.
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