Found this, although no details re a pressurised case there are other informative snippets.

A model of Noah’s Ark has been installed in Hebburn Central, on loan from Tyne & Wear Archives & Museums. The model was made by shipwrights at the ship repair yard of Palmers Hebburn Co. Ltd. It came 5th place in a national competition in London in 1947. The model was designed by E.L. Champness, and constructed by J.A. Cochrane, R. Crookston, C.A. Harding and W.J. Kennedy.

Cllr Richard Porthouse said, “I remember going to the Theatre Royal to see the Ark for the first time and was very impressed with it. The Ark looks fantastic in Hebburn Central and I hope it can be shown around the Borough”

Geoff Woodward, Museum Manager said, “I'm delighted that working alongside Hebburn Councillors and South Tyneside Council, Tyne & Wear Archives & Museums has been able to put this attractive and significant object on display for the community in Hebburn. It is a beautiful, historic piece that showcased the skills and creativity of local shipyard workers on the national stage and is a great source of inspiration and pride for today”