Tarn,
Don't have any 'Brunel' sources available at the time of writing, so I'm working from memory, but -
Brunel was pushing the envelope a little with the size of Great Eastern and exacerbated his problems by picking a slightly less than ideal spot on which to build her, a mudflat on the Thames. Too flat! She couldn't or wouldn't launch (sideways, by the way!) by gravity alone and I believe the best part of a year or so was spent jacking the old girl into the river. This incurred the design and construction of a battery of humungous hydraulic jacks, at least one of which exploded with fatal results during the course of the operation.
You didn't do that, of course, for 'a dollar-ninety nine'! An awful lot of backers exited the scene in droves and a dumper load of credibility was lost.
The ship sadly started its life deep in a financial hole and its designer was regarded, by some, as a laughing stock. Further problems continued during fitting out, and I believe she suffered a boiler explosion during her trials. By the time she was ready for passenger service it was almost impossible to visualize her making a decent return.
I believe she actually spent some time as a floating exhibition hall in an attempt to keep creditors away!
There was actually a rumour that the ship was 'cursed' - it being claimed that two skeletons of long dead workmen were found sealed between the double hulls! I wouldn't make any claims of the authenticity of that one, though!
Curiously, she was converted for use as a cable layer in her old age and did sterling service pioneering Trans-Atlantic cable installation.
Not much, off the top of my head, but maybe something to start with.
Regards,
John M