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Many thanks gentlemen that's very helpful. Cheers TT

What treatment or coating (if any) should be applied to the inside of a steel hull before applying sprayed foam (PUR or PIR) insulation? Thanks

Although on the Mississippi/Missouri, and with vastly different boats to what you propose, there's some great detail in this terrific historic resource on the techniques and difficulties of taking canoes up a big river. Lewis and Clark did carry sails on some of the variety of boats they used...

And, at risk of sabotaging your build ambitions...: Child's Sit On Top Kayak 1.8M (Junior Children Kayaking Fun) | DIY at B&Q https://www.diy.com/departments/child-s-sit-on-top-kayak-1-8m-junior-children-kayaking-fun-/0600988554122_BQ.prd

Hannu's boatyard has a lot of small, simple ply boat designs... Hannu's Boatyard | Free Boat Plans http://hvartial.kapsi.fi/ For instance, he's built the Portugese dinghy at 7'4" and 5'. Worth noting that even at 5', he's designed for a 115kg adult, so it is very beamy. For a child, the beam...

Not sure there's anything here that will precisely fit your brief, but perhaps some inspiration: Bumblebee Sailboat https://angusrowboats.com/pages/bumblebee-sailboat Micro Auray Punt | Free Boat Plans http://hvartial.kapsi.fi/ossauray/auray_u.htm Sweet Pea...

In the guardian (uk) British woman and husband found dead after failed Atlantic crossing https://www.theguardian.com/world/article/2024/jul/21/british-woman-and-husband-found-dead-after-failed-atlantic-crossing

Tally Ho has been launched :

I'm of the view that the R2AK would be a lot more interesting with judicious placing of checkpoints that meant a boat that could be portaged stood a realistic chance of competing with the now dominant large boats with large crews

Current records for pump foiling on flat water seem to be in the ball park of 25km: The Official Foiling Book of Records - Foil Pro https://foilpro.co.nz/world-foiling-records/

I can't imagine that the wings used by wing foilers are very efficient - that big fat tube as leading edge and then a single skin - is there a reason why a double skin couldn't be used, with membrane ribs and inflate the whole wing to produce a much better wing section?

An interesting project here, with respect to this discussion - using the sailrocket approach of the reversed foil anchoring the rig in the water:

A friend of mine, a Scottish fisherman, in a fairly remote village, has just converted his boat to electric, with PV on the boat. Interesting that it is a bottom up project, not top down. The biggest difficulty has been certification. The film , made by another villager, is not released yet, but...

Yes, and I suspect there are very good reasons why the Dutch, who are rather experienced at building water adjacent structures prefer concrete over ferrocement. I imagine there is fibre reinforcement, though I didn't find any sufficiently technical articles in the short time I spent looking...

The Netherlands are pursuing floating houses using timber superstructure on concrete caissons, tied to dolphins with flexible service connections where necessary: Waterbuurt - Amsterdam's Floating Neighborhood...

Mark Palmquist is exploring and prototyping some related ideas on Duckworks - might be worth a follow on fb

Ah, thanks for the enlargement, DC and BB - that makes a lot more sense - I was taking 'East Coast of Vancouver Island' a bit too literally I think. Btw, lots of landing craft of the sort of size you're talking about for sale in Canada - mostly Ontario, but a couple in BC: Landing crafts for...

This is possibly a bit off topic; rather than the barge design I'm thinking about the business case. With the proviso that my familiarity with the area is largely limited to being an avid follower of R2AK :) Just thinking aloud if you need to make a return on your investment. Seems the...

Given another 40 years of development of weather modelling and forecasting, an 'unexpected' severe tropical storm would stretch plausibility for me. But perhaps the container ship has lost communication through other factors? Or climate has become more unstable and harder to predict by then?