Wrapped everything up!
I am pretty much using everything from an old Cateye DoubleShot except the head unit.
NiMH battery pack running at 700mA.
Maybe at some point I will put together a lithium battery pack and an LED driver that offers different modes, but for now I am happy with it. The only thing left is..... for all this dang mud to dry up so I can tear it up on some trails!