Data Jukebox to 3d Printer Conversion

Started tracing wires, good news looks like I might be able to use the motor controllers and power supplies. there are 8 digital inputs on the motor boards, closer inspection hints that these might be step and direction pins for each motor! 

Can I,... Should I, even try to use the driver board (controller board, server) or is it proprietary?? only reasearch will tell... maybe a search through napalm (open ftp indexer) will yeild a manual?

Maybe its time to start thinking about the Z-Axis, the question seems to be, move the bed or the extruder and or tool head?

Looks Like I've gotten myself into a mess...... Fortunately after teardown and removal of non essential parts it looks like this might be easy enough. But for now there are a lot of questions. I've uploaded images from the teardown to imgur here:

 Part 1 and  Part 2

Are these motors accurate enough to be a 3d printer?

Almost all the limit switches are optical on this thing, is that good or bad for a 3d printer? 

I've heard that "inductive" limit switches are the new hotness, do I really need them?

The motor controllers might be salvageable and usable, saving some cash is always good. Looks like there are 8 "inputs" shared among the boards, since the original product drove 4 motors could this be step and direction for each motor?

What parts are left to acquire?

Smoothieboard or the Duet Wifi?

Which extruder? 

How to build the Bed?

How to do the z Axis, move the bed up to the extruder or move the extruder down to the bed?