The simple answer is that every 48x96 I have seen has NEMA 34s or better in it. You need the torque to accelerate the mass of the gantry or table. The last upgrade I did on a 60x120 I used Clearpath SDHP NEMA 34s. Worked just fine and the customer was happy. Better might have been at least 750W servos on the gantry axis. I have NEMA 34 steppers on my 48x96, they work OK, but could use more power.