First Flip Dilemma in Philadelphia

[Tomer Shani]

Hello BP people 

I've been buying and holding in Philly for the past few years. 

I'm looking at my first flip deal and came across a fundamental question. 

The deal is: A historic home of about 3,500 sqf. needs everything pretty much. Sitting on a great lots.

Purchase price is about 100k 

comps are around 300k 

I've found a GC that quoted me $50 a square foot. comes to to 175k for everything. which is very nice, but where's my profit?!

My question is, should I be my own GC / Project Manager and just hire subs?

From my estimates, I can probably bring the project for about 105-120k. 

What are you flipping practices? do you just invest it all on one guy, or do you load yourself with work (gaining massive XP) and saving some cash. 

What am I risking by not going with a general contractor? 

One more detail, if I do it by myself then most of the deal (if not all) will probably be cash. 

Thank you for your help