Cut out and fitted the proto board to add some area to the original PCB.
In the video I mention knitting the 2 boards together with copper wire. To line up the boards for drilling, I joined the board with doubles sided tape. Once done, I discovered that the result was strong enough just using the tape, which makes life much easier. Next todo is to remove the MCU with a hot air soldering iron, so will see if the proto board falls off with the heat!