Might sound silly, but would you not consider just reducing the height of the existing baseboard. 1270mm sounds a bit high to me and I am about the same height as you. But I am sure you know best.
EDIT: Sorry, I thought you were talking about a different layout, and not your "Waterford & Dublin Junction Railway". The above title D&WJR threw me. I see now that it would be no easy feat to reduce the height