Hi Bob,
I have a small milling machine resembling the Warco WM16, the main difference is that mine has a MT 3 spindle (and is a bit heavier), the WM 16 has MT 2. The WM 16 is slightly heavier than what you want, but it is easy to remove the head when moving it into your workshop (I did with mine). My milling machine is over three years old now, and has not given me any problems so far. If you want a milling machine with a brushless motor ARCeurotrade has the SX2 Plus, slightly smaller than the WM 16. With what I know today I would buy a heavier milling than the one I have, and get some friends to help me get the machine into the workshop.
Where I live there are several small shops working with steel or with aluminium, and they let me buy off cuts, so ask around. There is also several metal suppliers that advertise on this site.
Thor