I could certainly see a market for prototypical Irish lineside products. There have been very few available to purchase except for the signal box, station and engine shed by Bachmann and a few others by smaller companies. It would probably be prudent to appeal to as wide a group of modelers as possible by producing line side products that were prevalent prototypically. I'm not sure if anyone has ever posted a thread looking at the architecture of line side structures of (for instance) the GSWR, that may have been built to a general design. The product, (say) a water tower, might appear prototypical at any one of several stations being modeled or just for general use.