I don't want to put a downer on any of this but, I think you ought to work your figures out on 50-100 hours per year, instead of 150. most private owners that i know are flat out making even 50 hours per year.
that will make your fixed cost cost seem worse when translated into an hourly rate, or at least, much more conservative.
A rough snapshot of expenses follow for a working(500 hours year) cessna (300hp), based at a country Field, hangared at no cost.
- admin-$1500
- avionics upgrades-$660
- Insurance-$8000
- landing fees-$700
- minor plant-$700
- repairs airframe, engine, avionics and 100 hourlies-$25000
- Fuel and Oil-$40000. (edited)
- engine and Prop provisions-$20000
Is this any help??