Plowing is blood money!
Sounds like it is a nice account .............
But, are you really willing to give up a secure job and make your side business your only source of income is the question. Are you in a position that if it fails you can be ok?
I am probably the guy who people look at in my decisions for business and say you are crazy. But I always make sure if I fail I have a backup plan in place ready to go.
Good luck in your decision