Hi BAZ!
As far as I know, the Mesh network is connected to each other based on mesh nodes. Mesh nodes are small radio transmitters that function in the same way as a wireless router. Nodes use the common WiFi standards known as 802.11a, b, and g to communicate wirelessly with users, and, more importantly, with each other.
Nodes are programmed with software that tells them how to interact within the larger network. Information travels across the network from point A to point B by hopping wirelessly from one mesh node to the next. The nodes automatically choose the quickest and safest path in a process known as dynamic routing. APS in a wireless Mesh network can be interconnected by wireless connection, and multi-hop wireless links can be established between APs. So it is achievable.
Hope to help you!