Hi Jeff,
Have you gotten any response to your question yet?  I should be able to
answer both and didn't see anything posted to the group.

I'll assume you don't want to make an aluminum divider for 6M so why not
just use two pieces of quarter wave (or 3/4 wave), 70 ohm coax
(including velocity factor!) to transform the antenna impedence from 50
to 100 ohms.  Run the end of each into a coax T fitting.  Done!  If my
explanation wasn't clear, I can make a sketch.

You can make a six port just like a half wave style, four port divider
except with three connectors at each end and one in the middle.  One
quarter wave (free space) distance from the middle connector to the
plane of the three connectors on each end just like the others you've
made.  The inner conductor will need to be sized to give you 40 ohms
(sqrt (100*(50/3)).  Working backwards thru the equation Z=138 log (D/d)
gives you D/d =2, so the inner conductor should be half the inside
dimension of the outer conductor.  That way if you're using 1" square
tubing, 1/16 wall gives you .443" or 7/16" and 1/8 wall gives you .379"
or 3/8" for the inner conductor.  If you've built other dividers, this
should make sense to you.  If not, just ask and I'll make a sketch.
Which faces you put the connectors on shouldn't make any difference, but
for looks I'd probably make it symmetrical.

One last thought.  A 2M power divider will also work on 432 (3/4
wavelength instead of 1/4) so you can build one big one and use it on
either band.  I'm finishing up a 2M divider to use on my 432 array. 

Let me know how it works out.  I've been following your results on EME
with interest, especially your increases in antenna size on 432.  My
4X19 array crashed before I made any Q's but I hope to put it back up
this year and at least work some of the big guns.  I have eight yagis
but they're kind of thrashed so it's easier to get four good ones from
the parts rather than fix them all.  Also I think the Yaesu rotor
wouldn't last long swinging a 15' wide array!

73,
John, KJ6HZ