To start with I bought a Britannia Miniatures royal navy landing boat with crew (code BRW4); this gave me 10 rowers and some seated figures - these are napoleonic naval figures so they need some conversion.
I made up the small rowing boat first, by making an insert to fit into one of the boats I made for my 17C bridge of boats. The insert is just smaller than the base of the boat and the seats are made using
foamboard strips with Daler mounting board on top
The small row boat ...
now what about transport and landing barges ? hmm ... more work for the shipyards 😀