I don't
liveaboard but I think it is doable but tight for that size of
boat and
budget.
Things you would need to consider would be your boat slip, hydro,
insurance and all the nickle and dime
fees that a marina charges (ie. pumpouts). Then you would have living expenses which can be as frugal or extravegant as you desire. Then there are
repairs and maintance which is variable depending on the age and condition of the boat and your level of skill and need to fix things. The problem with
cheap boats is that they are cheap beause they need a lot of
work.
In the Toronto area my guess marina related
fees would be about $6-8000 per year or more for that size of boat to live downtown and maybe less out in the boonies. You would need to find out what your local
marinas charge, however. Some marines here also require surveys to ensure the boat is
seaworthy enough to grace their docks (a $400 fee).