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The workspace:

The space for the cabinet measures 45cm W x 75cm D x 2.5M H. As we live in a one storey bungalow, above the ceiling there is the attic, in case anyone wants to suggest I vent there, which is something I would consider. 4" trunking will be in the back left corner for all of the network, satellite, and speaker cable etc. There is also a small hole in the stud wall which provides access to a 2" pipe running to where the TV will be mounted on the stud wall, visible where the other hole is with the earth cable hanging out for fishing cable through later.

I picked up 12 of the following at IKEA which I think should serve well for shelves allowing airflow:

Three of these side by side measure slightly more than 45cm x 75cm so I am just going to cut them to size with a hacksaw. The carpenter is building the cabinet, supports for shelves on either wall, and leaving cut-outs for vents above and below the cabinet door.

Initially I had thought about having either the exhaust or exhaust and intake venting into the attic, ducting etc where required, but then I realised that I probably will not get this cabinet 100% air tight and I do not want to lose heat from our newly insulated living room into the attic. An advantage to using the attic is that the door of the cabinet would go from floor to ceiling without the vents (and possibly the fans behind them) visible, and it would also keep sound down, if that could be an issue. I figured with the intake and exhaust vents on the front of the cabinet facing the room this would negate that. Please let me know if this is something I should reconsider, in fact, if there is any part of this project you would do differently let me know, that is why I am posting here!

Although things would be much easier if I could buy from a local provider, as it would allow the carpenter build them into the cabinet, what is available does not seem to suit, and this is the same across different stores:

Considering I am planning to put in three 120mm fans side by side none of them are 360mm wide, and two of the vents would be too wide for the cabinet. Even if they were the right size, none of them look like they would let enough air through for a cabinet containing a future overlocking PC, along with everything else mentioned?

More info on local provider vents here:

A local ventilation company have told me they can make the following vents within a week for any size for €16 each, and I was going to ask for two, 360mm x 120mm:

There is a stabilizer/dampener behind that vent that is apparently for when it is placed in a door, and mine will come without that.

For the fan system I was going to order the following:

Phobya - 230V to 12V Power Adapter - Molex 4-pin Socket
CG Thermal Fan Controller (Rev. 4)
Noctua NF-F12 PWM
3 pin Y connector

I was going to ask the carpenter to make the cutouts in the pieces of wood, above and below the the cabinet door, deep enough for not only the vent but also the fans themselves, or would I be better securing the fans to the wood (that the vent is in) with a plate that is meant for three fans? The only ones I can find are part of expensive kits like:

Coolerguys Cabcool1203 Three 120mm Fan Cooling Kit

For the shelves I was to use the very top one for a future overlocked tower case PC, and set it 75cm below the ceiling for that purpose. I actually have a beautiful Fractal Design Node 605 HTPC case which I had thought I could re-use in this cabinet, if I bought a new case for my main PC, but it is just not going to fit. The lowest shelf is going just above the height of the lower vent and fans. I was then going to split the remaining space for the last two middle shelves. It seems like 45cm around the width of a Cisco/HP 24P PoE managed switch, and with those venting out their sides, I will have to mount that to a wall on its side. There will be a future NAS going in somewhere, the modem, some consoles, satellite receiver etc.

Would having three 120mm fans behind both the upper and lower vents be overkill? I ask as someone from the ventilation company said I probably only need to put fans in the upper exhaust vent as air will come in from the lower naturally.