I would not even waste my time on a flux core set up and especialy a harbor frieght one.you need to be able to weld with out splatter and slag. get a true MIG set up with gas. Spend a little more and buy a better set up. A cheap TIG would work for most of your gun needs also.
I relize you feel that all the parts You need will dissapear suddendly but IMOO you need to relax a bit and concentrate on one project or two and then worry about every other idea that comes to mind. I have way to many projects going and it makes it no fun to do any of it. You mentioned your on unemployment so unless you have a savings acount id really think wht you got to have. trut me when I say its really easy to get several thousand dollars or more in misc small parts that you really dont need . It can easly becone a obsession.