Once again, thanks for all the help. The chords as given above are what I had worked out from the Clancy Brothers and Tommy Mskem's version, but they did it in the key of D.
As to the pronunciation of 'Oíche mhaith' although it may not look like it to anybody who does not know Erse, that is in fact what the Clancys are singing which to the uninitiated does sound a bit like "Ee awa".

I will be uploading my version later today.

Thanks again for all the help.

threelegsoman