Residential per-unit WLAN with Roaming?

Hello guys, My NOC Supervisor and I were just having a conversation about a potential Multi-SSID WLAN project for some residential buildings.

The idea is where we would have multiple APs for each residential unit/suite, per floor, say 10+ Floors. Each AP would be preconfigured have each SSID be in it's own VLAN(For customer LAN enviroment) and to broadcast the SSID assigned to that unit so the customer may access their network at home.

The AP will also be broadcasting, or rather not, every other non-assigned SSID(for the whole building) as Hidden Networks, to allow roaming, for the same unit-SSID everywhere in the complex without drops.

Very ambitious, I guess at this point the limitation would how many SSIDs a single AP can hold.

Based on some articles I read, there is a range of between 0-64 SSIDs per unit so I don't think thats an issue.

Seems like it's more of an overhead problem where the more SSIDs are in a network, the more ssid beacon frames are sent, slowing down the network with upwards of 50% management overhead.

I was wondering if you guys had any ideas as to how far we can get with this idea?

I had another idea with GPON equipment and programming magic to make the ONTs broadcast 2 networks, one home and one single community-ssid for non-LAN access (IP Isolation) and when you connect to the lan-SSID, it automatically connects you with the hidden one.