The market varies considerably from one place to another. To be blunt, yours
is much too complex a question to be answered on a news group. I would want
to see a proper business plan with market surveys and at least a ten year
budget with supportable income and expense figures.

I will say that Cessna twins are said to be pretty good aircraft, reliable
and relatively easy to maintain, and that you may have some misunderstanding
about their 'problems.'