Hi,
Since my last post i've managed to find a great deal of information. I've got my hands on a couple of papers written about the column and their activities, including a couple of detailed descriptions of the column's "last stand" at the battle of Pikes Bridge. I was given a full list of the members of the column as well as some other documents. The five who were executed were not original members of the column but joined after the abortive planned attack on Baldonnel, they were free state deserters and as such they were shot as deserters rather than republican's. The rest of the column narrowly escaped a similar fate and instead most of them ended up in Mountjoy and then later some of them were sent to Tintown, many of them involved in the big hunger strike.
Message me and we'll see if we can help each other out; be great to compare notes.