You're my kinda idiot. I'm running vms on my esx box on iscsi shared storage from FreeNAS. I only have 1gb right now, need me some 10gb.
Theres always a risk basically with using FreeNAS and iscsi this way, especially with VMware apparently (check out sync vs no sync writes). I chose to split redundant vms across a small ssd hardware raid pool in esx and shared iscsi storage from FreeNAS. I also made sure to thick provision any FreeNAS based vm. Obviously, back up your S. I only have the VMs on the hw ssd raid array and the FreeNAS iscsi big enough for the OS. In my case, I store data that I wont use much to unraid (yeah I have a 4u for that too) and stuff I'll need to work on a bit on a different FreeNAS share.
Esx - 2x 10c/20t v3 xeons, 32gb 2133R ecc (ran out, need 32 more), all on an x10dri from supermicro. Lots of vms, victim vms for security learning, encoder vms, gaming vm - this one is neat
Unraid - 1151 platform, dual core pentium (thinking about going to a 2011R3 platform), 4gb ecc unbuffered, 3tb data drives - two paritys. Mostly media and software here
Freenas - mainly for iscsi for esx and the new/next hypervisor box - 2011 v2 xeon, 64gb ram (might add x2 32gb dimms), many ssds from multiple ssd lots on the bay, some spinning rust for bigger sfuffs
It's a bustling little (not really, 42u rack with 18u filled) homelab.
I can dig the 1600, thinking about setting up a non VMware hypervisor on a 1st gen Ryzen also.