These are built by George O'Rourke (MRSI), the 'Master' Brendan Kelly (MRSI) produced a limited number of kit parts for these locos, and many others, for members to put together.
I have a set of parts for the 121 and when I saw George running his yesterday it inspired me to search the dark recesses of my attic and find the kit!
Also;-
My 141 by Brendan, yet to be finished and may visit Maam Road soon!
Eoin