50hrs a week and 5 flight hours a week is a pretty big load. 5 flight hours for a low time private is a good amount a week. Each flight will be around an hour, and that is a lot of information to absorb. On your initial training, anything over 1.5 id say your brain wont be able to work as hard. It is alot of stuff thrown at you. Maybe alot easier in a non controlled area/airport. Also depends on how good your instructor is.
I would go on a discovery flight with a GOOD instructor and see how it goes, and tell him about your plan. See what he says.


Also have to factor in weather and maintX. There will be some days that you are grounded...

If I were you and wanted to get your commercial ASAP and start flying as a career, make it a priority.
Really depends on your living situation. Family, bills, ect. If you dont have any of those, or just a few bills, go get financed for half of the price of training and the rest cash. Work less and fly more.