Thanks David,
The overall footprint is around 1200 x 550mm and this was taken from the original Dundalk engineers drawings. As stated earlier, some alterations were made to the roof when the height was greatly reduced in 1955. Over the years some arch openings along the side were built up with stone from the reducing work in an attempt to secure the building. The huge sheeted doors were pulled at night to close the rear and front access to the store interior.
It will make for a small shunting project but I believe, with only 2.8metres aavailable in total it will lend more towards a diorama than actual layout.
It has generated much interested locally from the few surviving GNRi staff in town. This pleases me more than anything.