Andy, I have a better and less expensive idea for you. You can run vmware free (vSphere or esxi, same thing). Runs wonderfully on an old Dell 2950 server, must be series III I think. $500 list at flagship where I bought all the parts to convert mine to series III, CPUs, memory, spares and a few failed power supplies. This is the rack version, there are tower versions, but I would go rack and set in in the basement, closet, shed or anywhere you can get a network cable to. Set up all the win 7 VMs you want, then you can just get to them via windows RDP, a web browser on any OS, or in windows through a console program you install. Your only limitation is hard drive space for how many VM's you can have and memory for how many you can run at once.
Dell PowerEdge 2950 III Server - 2x 2.33GHz Quad-Core E5410, 8GB, 4x73GB
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vSphere 6.x is horrid and requires more server.
I have four 2950, one is a backup, but in use as a regular not VMware server. 3 are maxed memory, 64 GB, maxed HD space 10TB (about 9 after RAID 5 and installing VMware). I bought the best CPUs, but those hardly wiggle. The limitation of free is you can not cluster, but if you raid 5, you are in better shape than most home computers. Cluster for biz is good, very expensive and gives failover and load balancing. It can move VMs to the least busy server. I am provided a laptop, netbook and a PC for home use by the university, otherwise I would do the same. Not as simple as separate boxes for initial setup, but nothing you can't do in a day. I've never worked on the tower version, but the rack is super easy to get in and do upgrades or anything like that.
If you are interested, let me know, we can hammer out any details or questions you may have and I get a hell of a edu discount. I'll bet I can get you a good discount if I tell my contact what you are doing (non-biz/home use) and yer my BFF

Uh, maybe I'll just say good friend
