im currently using icute casing for some time but now i think i wanna change to horizontal casing (or how should it call?) due to space constraint on my desk

problem is...is there any GOOD horizontal casing which offers good airflow, got at least 3 internal bay for hdd and is not too thick (i got like 15cm height space horizontally cos ill be putting my lcd on top of the casing)

alternative : build my own with acrylic but it gonna takes alot of time which i hardly have

my allocated pc portion on my desk
41"x30"

currently my setup is casing at the back of my lcd which im not quite comfortable and b4 i switch to this setup my casing is on my right which is 'quite' spacious from lcd to keyboard but not enough space on the side. hope u guys can imagine it hehe. so i wanna try whether horizontal casing will provide me more space on my desk. 1 more thing, i cant put my casing on the floor cos my desk is custom ordered by my parents years ago that the whole desk is 'glued' against the wall and no hole for the cables to go through the desk due to drawer bottom it. is a very sick design i admit it

another alternative :
custom build a drawer to fit my mobo + etc into it but drawer height is around 9cm only which i think not enough. but the dimension should be ok.

thanks for the inputs...the best is if can transform into like dell 1u. the most space-saving casing

i know the table can be drill for the cable hole BUT my table top got a piece of glass glued to on it. is it posibble to drill tru glass n wood?