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A couple of points with respect to welding aluminium with a MIG.
You don't absolutely have to use a spool gun or a teflon torch liner, although they will make life easier.
You don't absolutely need a high current welder to weld heavy gauge aluminium. The welder I have at home is only 130 amps, and while it is true that most people will struggle to get a decent weld on anything greater than 3mm plate with it, it is also true that you can get decent penetration and a cosmetically perfect fillet on 1/2" plate using the same welder.
The trick to it is to break the oxide layer first, then preheat the weld site using a propane torch.
Easier still is to just use a TIG. If the dimensional stability of the piece you are welding is critical, TIG is the only game in town (for aluminium).
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