Really good effort here Sean - and it's clear you are finding this fun and rewarding which is critical to sticking at it! If you haven’t got this book, I’d recommend it....https://www.abebooks.co.uk/9781857801859/Modelling-Irish-Railways-Johnson-Stephen-1857801857/plp
Published before much Irish RTR was available, it gives a good introduction to some simple conversions. Also search the back issues here to see what some folk have done...https://newirishlines.org/
That 6w chassis could make a nice coach too, if you wanted to cut and shut some of your 4w bodies...,.