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What I/O do you actually need?
 
The 7I95 is fairly limited so a full 5ABOB configuration will not fit.

5ABOB inputs will be available with the standard firmware
as are GPIO outputs. It may be possible to make a configuration
that fits and does what you need by eliminating unused features.

 

No, the driver will not allow that unless you disable the encoder function
and the encoder pins are always inputs on a 7I96s (hardware determined)

As the topic is quite changed from the original question it felt better to start a new topic with the new approach:
forum.linuxcnc.org/12-milling/55747-how-to-build-a-cnc-mill

As my somewhat naive start into the topic in this thread:
forum.linuxcnc.org/12-milling/55699-any-...th-cnc-step-machines?
has mostly changed into another direction, I open a new one.
The goal is to end up with a machine able to work mostly flat wooden material mostly up to 27mm thickness with a working area of about 1500x1000mm. (Most likely by buying a made ready chassis and fit it with the desired motors, drvers, controller, spindel/router)
As it is -as several members mentioned in the other thread- kinda unwise to dump a few 1000 bugs directly. I decided to take a less costly path first. As I would love to have some use other than learning I'm thinking of this approach:
-getting a small, used desktop sized 3-axis mill chassis (around 200x200mm) with steppers and start from there
-purpose would be something like prototype PCB milling, some small wood pendant engraving
After I have that running turn to the larger machine, with the lessons learned from the mall one.