The tabletops also seems a bit too thin and wiggly for my taste, but, honestly, for LAN parties with chill people you personally know — it's ok
As for the actual host setup with a singular disk image — great job! LAN gaming centres do something similar with their setups, with some differences (a lot of centres either use Windows-based diskless solutions that mount vhdx files as drives remotely over iSCSI, or use ZFS-based snapshotting, which is my personal favourite)
But all in all, seems like my dream house :)
I own a chain of LAN gaming centres, so the feedback is definitely skewered into the business perspective quite a bit