10.5 x 25 cnc plasma table retrofit

Here is photos I don't think they attached in my first post 

First picture, the black servo positioning something or another is what we today call THC, and all that (but much faster) today fits in half a cigarette box! I would get rid of this so fast....
The attached picture with 4 boards, the left one is the power supply for the next 3, those 3 are the servo drives with lots of electronics, so i would really try to save this, do not worry about the broken encoder connectors, encoders should now be wired to Mesa board.
The box with PLC, i would also get rid of this, fast, all that is now done in software and through a Mesa board.
I would suggest getting a Mesa 7i96S with 7i85 and 7i83 and THCAD for now as this will be good for analog (existing drives) and new drives with analog or step/dir controls.
There are cheaper combos or single board solutions like Mesa 7i97T that everything for analog servos and encoder feedback, or 7i92TM with 7i77 that is the same things functionally.
For new dives with no feedback to LinuxCNC, 7i96S should be enough and you can add 7i85 for encoder feedback at any time later, or single board solution with encoder feedback = Mesa 7i95

I think that one of the 3 drives is for the slave axis on the Y. I don't know where the Z drive is hiding I'm assuming in the RSVP box or in the controller I included a photo of below. Do you think it's still worth it to reuse the motors and drives? I also included a photo of today's work on the machine I got it all stripped down. It still is a heavy gantry I have yet to weigh it to size motors but I Would guess when all put backtogerher 500+ lbs.

Z axis is in the rapid servo positioner box, aka the old THC, so that would need replacing, a cheap stepper drive and motor should do just fine.

So your recommending the mesa 7i96s a 7i85 and a 7i83 and THCAD and I could use the stock motors see if they work with this combonation of cards then upgrade down the line if I decide I want better performance. Would this combo of cards support large servo motors and offer great motion control? I included a photo below of the rails turns out I actually have enough to make a 50 foot long cnc. I don't think I will ever need to cut 10 sheets In one go but i was thinking of making 25 foot a water table and keep the other 25 foot to plasma cut beams and maybe a large rotory axis. May aswell set it up am I right? 

Yes, yes and oh yes!
I like your idea of the combo, go for it.