On mine I originally filled the master cylinder by removing the transmission cover and using a funnel with a tube. I've since opened up the hole to allow direct access, and made a new cover. Its under the floor mat so no one even notices.
I put a couple of bends in one edge of a rectangular sheet of metal, so it would slip under the floor near the transmission cover, and then simple screwed it down. Works perfect.
The A833 has been used by several guys I'm aware of, and they all seem pretty happy with it. Another option is the T-5 5-speed, but it is not a stout as your A833.
Regarding the shocks I'd look for the brackets used on a later AD truck that had tube shocks and swap using those.
