I got this map of the PRONI website showing Lisburn station in 1846-62.
You can see the gardens of the house and a path leading down to the bridge beside the station.
If you use a black beetle motor bogie for the front 4 wheels and have the 2 back wheels
as non driving you could build a chassis for that with all the spring/axle box detail added by
yourself. The back wheels could be made to slide from side to side for curves.