It's a big hole indeed, but the way Elliot cut this chassis down to 80mm was the way the chassis needed to be cut from diggity design in the first place, minus the big hole of course... I think it's the thinnest chassis out there, and diggity design should consider cutting their next chassis the same, but without the hole....lol..... I guess my 70mm design was a bit extreme, but 80mm is good enough...lol... Good Job Elliot, and with such a stiff 3mm chassis, the big hole won't mess it up too much...