As has already been mentioned, Parkside Dundas produce a kit of the BR Palvan (listed for sale at £9.00 + P&P on their website), which along with some styrene sheet and a bit of hewing with a craft knife, will produce a more accurate model of the CIÉ pallet van for less money.
http://www.parksidedundas.co.uk/acatalog/copy_of_BRITISH_RAILWAYS.html