POWERSAT CONSTRUCTION FIXTURE
                         David Dietzler 2008
The first job for workers at the L5 construction shacks after parts making from lunar materials will be the erection of a very large fixture for supporting power satellite frame members as they are fitted together and welded together by robots teleoperated by humans in the pressurized habitat with 3D googles and manipulator controls.  Once the fixture is completed it will use grippers-meachanical hands to hold on to powersat frame tubes as the frame is assembled.  The fixture does not have to be as large as the whole powersat frame. It just has to be large enough to deal with the pieces being assembled.  Once the kilometers wide frame is assembled robots will add solar reflectors/collectors and thermal power systems or silicon panels onto which sunlite is concentrated so we can get more power or "bang for our buck" from costly silicon PVs.
Robotic OMVs will use oxygen cold gas thrusters with O2 stored in 10,000 psi titanium tanks and RTGs for power
From: http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator

We find that

GPHS-RTG used on Cassini (3), New Horizons (1), Galileo (2), Ulysses (1)
300 W electircal 4400 thermal   238Pu 7.8 kg. of fuel  mass  55.5 kg. RTG mass


MHW-RTG Voyager 1 (3), Voyager 2 (3) 390 W electrical  7200 thermal 238Pu ~4.5 kg. fuel mass   39 kg, RTG mass

Three  MHW-RTGs could supply 1170 watts electrical or 1.57 horsepower for electric motors on a robotic OMV mechanical arm.  The mass of the RTGs would be 117 kg.  Not to shabby.  Almost 1.6 hp should be sufficient for manipulating lightweight tubular steel and aluminum parts in "zero gravity."  If one hp is devoted to the mehanical arm's motor 424 watts would be available for the robotic OMV's onbaord systems like attitude control gyro wheels, electronics, thruster solenoid valves, radio transciever, stereo TV cameras, cooling system pumps, and spot lights if the OMV is shadowed by constructions.