It sounds like you have some work for what you have, and since you have a generator that opens up a lot more options. Field work is something that is a great fit for a small business. For the price of a lease payment or two, you could own a PowerArc unit to give you stick function. They run great off generators, since inverters need less power than transformer machines. You might notice that Sean refers to his PowerArc as the real "Money Maker" for his business. He also runs a generator and does field work. There is always a market to fix what has broken. The PowerArc can even do some DC TIG for some of the precision steel jobs you mention. You could get to work and see if there really is a market for your services. Then later add aluminum once you're up and rolling. Then when you have a profitable business, places like credit unions will be more interested in talking to you, too. Remember, then is a lot more than just the price of the machine, too. The extra odds & ends you need to finish can be almost as much as the machine. Things like the cooler, gas cylinders, filler rod, long cables, torch parts. It all adds up. One more thing, is that since you have oxy-fuel, you can apply some pre-heat before you MIG. That will give your little machine a boost in the material it can handle. For mobile work it's all about service. Show up on time, and fix the problem and people will call you back.