Oh dear, this is a very scary coincidence....
(with apologies to John for paraphrasing his post)
Years ago I bought a single cylinder steam engine from a bloke in a pub (who turned out to be the local blacksmith) for no other reason than I wanted a 'proper' steam engine.
So there we have a strange 2
1/2 x3 stationary steam engine sitting on the bench 'going spare' . My only project to 'use up' this spare engine was to consider building steam boat. To this end I aquired a set of drawings from selway fisher for an 18' launch. I should note at this point that I was living (alone) in a terraced house with 8 sheets of marine ply stacked in the hall.
I marked them all out on the dining room table and then got married, and had to put the bits away.
And so my pile of plywood and the engine sat in the spare bedroom with no real workshop facilities for ages and nothing really happened. In the end I think deep down I have too much respect for drowning to 'set sail' (or whatever you do in a steam boat) without being able to swim. I'd be happy on a canal or river but my partner, who is a life saver, would be a nervous wreck. Marriage, coupled with my total lack of ability in the practical arts meant that I had sort of run out of steam to do the project.
Later on I acquired a small vertical watertube marine boiler and a workshop, where they both sit folornly in the corner. The plywood has mainly been converted into buildings for the garden railway, and I still haven't learnt to swim.
I look forward to seeing more about John's project.
PS. ...and my engines' got reversing gear