Possible, yes. Easy, no. Don't assume any ole air cooled rack (or datacenter) can manage 40k per rack. It makes it really important to do the hot isle/cold isle well, manage the airflow carefully, block any empty rack units, etc. etc. etc.
Yes, wouldn’t want to try and design it myself! I think the datacentre providers I was looking at spend quite a while doing CFD simulations to get it right!