Paddy Dillon's book
Irish Coast to Coast: Dublin to Bray Head (Cicerone Press - 2005) may help, describing an Irish CTC combining several waymarked trails. The website
walkireland also shows the very similar track of the E8, an E-Route, again with details of these individual routes. In England the E8 uses the Trans Pennine Trail to go coast to coast across England. The European Ramblers Association (ERA's) website carries E-route details including in Ireland, and is linked from the E-Routes pages on this site (
http://www.ldwa.org.uk/ldp/public/e_routes.php), that give some background on the E8. But Paddy's book may do the trick. There are maps available from Ordnance Survey Ireland and EastWest Mapping (
http://eastwestmapping.ie}.