You know I could help with any Irish projects, since I live in ireland, and living right next to the enterprise route helps a lot too. I saw a download for the DART line on the DLS, but the user who made it must've deleted it.
Anyway, for the rolling stock, heres how it can go:
Reskins: Enterprise = Class 222 coaches
            Intercity MK3 = BR Mk4 coaches
            Intercity MK2 = BR MK2f coaches
Tweaks: 2800 Commuter = Class 158 with relocated doors
            MK3 Push-Pull end wagon = MK4 fitted with cab
            Enterprise Push Pull end wagon = Class 222 cabs with tweaked front end
The stock needed to be created from scratch:     
           81/8300 DART
           85/8600 DART
           29000 Commuter DMU
           Class 201 Loco
           Class 071 Loco
           Most of the stations/Buildings (Dont worry, I can work on them)
Since I live on the Enterprise line, I can help with the development of these, no mater how long it takes.