That pack promises to be awesome !!! Thanks a lot for having an interest in 80s and 90s wagons !
Might be a bit too late, but have you ever considered the Frangeco 66 ? Most of them were used by French company STEF, but some ended up in the Interfrigo pool ( 200 units ). I can provide dimensions if needed. ( pictures from Docrail.fr )
[Blockierte Grafik: https://docrail.fr/wp-content/uploads/2020/03/Ibbes-IF-2048x1246.png]