Hey barnitto,
just reviving your old thread as I was wondering how you were getting on with your new cabinet, after a few months in are you experiencing any problems?
I am still playing around with ideas and think I have what I am looking for now (with the wife's permission), the only difference between the 3 images is the greyed out area which is mesh. The images show individual mesh panels only over the speakers, individual mesh panels over the whole top half or one fixed piece of mesh over the top half of the cabinet. The wife likes the third one most as it's less fussy!
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I was basing my idea off of an image from Avsoul that I like (below).
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I'm looking at the frame being an inch and a half thick and the shelves an inch.
Note that regrettably my Left, Centre and Right speaker will need to be housed in the cabinet as it is impossible for me to have them on stands

currently they sit on an old Stands Unique glass shelf so fingers crossed I shouldn't notice any loss in sound quality.
Let me know what you think and if you have any suggestions then please let me know.
thanks