First: markings
Second: small holes drilling (2.5mm, easier)
Third: bigger holes (7mm)
A little test with a 12V AGM battery: it blows well, enough to egt all the hot air out when charging or discharging I think; And it is very quiet :-) with or without the doors closed
Two extra holes to put screws to hold the shelf, otherwise it just falls (!)
I bent a little bit the base of the second shelf and put it on top of the bottom metal sheet
Bending on this corner side
