I cannot read a word on that site (You know us Brits we dont learn much in our SKOOLS) LOL
Mate, a picture is worth a thousands words. However I'll try to translate that for you english speakers out there.
I haven't used the filter from Modus as it is too expensive, but instead I've used a filter from Clio 3 (part number 77 01 062 227)
This is the cover that seals the filter's housing [attachmentid=25305]
I've cut it out by drilling one hole after another with a drilling mill and a small saw. [attachmentid=25307].
After that I've smoothed the cuts around borders using a grindstone attached to the drilling mill (minimum efficiency) then a coarse file (much better!) and then a fine file for smoothing.
This is the filter; it goes into the housing with the upper side first. [attachmentid=25308]
The filter is thin - it is actually a thin, kitchen hood filter on a plastic netting.[attachmentid=25309].
Inserting the filter into it's housing [attachmentid=25311]
The finished assembly [attachmentid=25310]
Because the lighting in that area is very weak I've came up with a state of the art, high-tech sollution
[attachmentid=25312]
With this occasion I've realised that my fears were not founded (I thought that there would be no space in front of the filter for the airflow)
In fact there is a tunnel for the airflow just in front of the filter.
That place is surely designed for the cabin filter.
PS: after cutting and smoothing there will be quite many plastic debris inside the filter housing.
As it is very difficult to clean that place up I've closed the air vents, moved the ventilation directioning to "air vents" position and started the ventilation on "4" (maximum).
As the air vents were closed, the air was directed to the newly cut opening in the filter housing thus cleaning the debris in that area.
But still you have to clean up the debris at the base of the condenser, which do not come out with the airflow.