At a previous job we had some decent on prem resources for internal services. The SRE guys had a bunch of extra compute and you would put in a ticket for a certain amount of resources (2 cpu, SSD, 8GB memory x2 on different hosts). There wasn’t a massive amount of variability between the hardware, and you just requested resources to be allocated from a bunch of hypervisors. Turnaround time was about 3 days too. Except, you were t required to be self sufficient in AWS terminology to request exactly what you needed .