Finished my hub/transmission modeling.  Everything is properly clearanced.

I cheated on my transmission to get the gear ratio I wanted.  I specified 6 planets, but I'm going to use 3.  The calculations for the additional planets changes the output ring tooth count and cuts my gear reduction down to 39:1.

39:1 reduction will give me 77 rpm at my output when my DC motor is running at its rated speed of 3000 rpm.

77 rpm with my 150mm diameter wheels gives me a ground speed of 36 m/min.

36 m/min translates to about 1.35 mph.  

That is a little slower than I was aiming for, but I was also going to use larger filament loops before.  It will work.