Finally assembled one 6 volt panel and I am really happy with the results. I ended up using 26 AWG tinned bus wire and doubled it up (had it lying around). Seems to work fine. Frame was made using an 8' length of 3/4" C channel aluminum from Home Depot. Mounting strips were added using 1/2" aluminum angle. Pop-rivets held the angle pieces to the frame and also doubled as extra support for the 1/4" glass top. Placed outside today (mixture of full sun and clouds) the array puts out enough power to brightly light a MAG light 6 volt bulb and run a 9VDC geared motor at what looks like full speed.
Using my el-cheepo Radio Shack meter I read 9.6 VDC open voltage and 6.3 VDC with the bulb in place (not sure if I'm testing correctly for the short-circuit measurement). The meter has a max DC amp rating of 200 MA (and the probe ports seem to be mislabled) so I do not trust the reading I get and will not report it.
Left to do with this panel is fill with a dry gas. I'll be using helium.
In the future, if I purchase glass for use in the panels, I will purchase 11"x36.5" sections. The 10"x36.5" works ok but the frame shades about 1/4" of the top and bottom row of cells.
One down, 3 more to go...
Joel