Beautiful job!! Yes, carriages like that did run here. There are several possibilities. The only carriages ever to run in Ireland with bowed in ends were of WLWR origin. The lighter unlined green you have and snails indicate a late '50's repaint, so your coaches are probably kicking about Dublin to be brought out on Naas race days, or set to work on the Portarlington-Athlone train, or maybe based in Cork for local traffic. With a clerestorey roof, though, you're looking at a handful of GSWR origin vehicles.
The WLWR only had six bogie vehicles! That narrows down the nearest possibilities to 48ft brake composites 102/3, which the GSWR / GSR / CIE renumbered 937/8, both built in 1898 and surviving until 1955. For light green, you're just in there! But they didn't have clerestorey roofs... which if you were really keen, could easily be remedied. One of those would be your brake. The full-3rd or full compo you also have would be closest resembled by WLWR 95/6, built in 1896. These ended up as GSWR / GSR / CIE 986 and 987, scrapped in 1960 and 1959 respectively. Again, standard WLWR bowed ends, but no clerestories. If you prefer the clerestories and ignore the bowed ends, the GSWR built eight coaches, drawings for which haven't survived, but that according to specs in the GSWR carriage book would be like thefull-seating one. These were numbered 507 (1885), 487-90 (1888) and 465/6, and 502 in 1901.
The above would be the closest to what you have, but they do "look right" irrespective of whether you want to be that strict... and an excellent paint job too. As I say, if you really wanted to pass them off as an actual vehicle, I'd go for replacing the roofs with normal ones, and numbering them in the WLWR series. Hope this helps!