Burnthebox, my own models were unfortunately handed onto another enthusiast maybe 25 years ago - but I'm assuming you mean photos of the real thing rather than my crude attempts. The archive of Ernie Brack on Flickr shows this type of thing to perfection. Ernie took some great photos of wagons back then. Various Colourpoint books show livery details too - albeit usually (obviously, prototypically) very heavily weathered!
Basically, Irish railways almost always* painted wagon chassis the same as body colour, buffers etc. included; whereas British Rail and Hornby painted them black!
CIE almost always painted wagon roofs the same as body colour too, though these weathered quicker....
* One exception was NCC "Brown Vans" which under NCC, UTA and also NIR ownership always had black chassis.... Other NCC wagons, along with GNR, GSR and CIE examples, had body colour chassis on all standard types.