Regarding the AU-919 'bonnet' - the top is 42.1cm (16 7/16") Wide, Depth (front to back) is 37.8cm (14 15/16") and Height is 15.2cm (5 31/32")
The rows of perforations (38mm x 2mm each) are set 10cm (4") back from the front edge, and are in 7 rows of area 37.2cm x 21.6cm (14 3/4" x 8 1/2").
Note that there are no heatsink 'chimney' holes in the bottom cover, just a similar area (in 6 rows) of 30mm x 3mm perforations.
All the above measurements are taken from
my AU-919 cover.
I hope this helps.