This FAQ gives a few insights on TP-Link's MAXtream - quoting for future reference http://www.tp-link.com/en/faq-694.html

4th computer was the charm, go figure. :/

Nice thinking...So I take it in this case the modem/routers already operating at Stations A and B will need to be setup as plain bridges to the CPE (as in disable their DSL PPPoE interfaces) in order...

Victor, it's pretty simple actually..here's an outline let me know if you need further clarification vDSL base - vDSL modem with LAN/WiFi clients - DHCP server active, IP pool 192.168.1.x - CPE setup...

Peter M wrote That's fine then - as for the firmware update, I have no further advice for you. The few times I've done this, with very old TL-PA251 and recent TL-PA8030P, it worked, no tricks...

Thanks for the reply Victor, hugely helpful. Bare in mind that I have to achieve this using 3 CPEs, while the lowest you describe on the topologies you provided above is 4 CPEs.. One thing I must...