This is going to be a neat project to follow.
Matchbox's Stranraer kit was for me one of those kits you intend to get but never get around to doing so because other interests get in the way.
Do have an Airfix, I think, Walrus half done in a box in the closet.
A couple decades back there was a Yahoo group for operating cardboard boats - any chance of waterproofing the Stranraer and floating for photos?
(hmm, "Floating for photos" sounds like names of charity drive events)