There are several questions:
1. Will you use microstepping for your stepper motors?
2. What pitch of gear rack are you planning on?
3. What gear pressure angle will you use, 14-1/2 or 20 degrees?
4. Your carriage weight seems awfully light; does this include the torch lifter,
torch, cross axis drive, popwertrack etc.?
5. Will you do plasma or oxyfuel cutting?
6. If plasma, what torch power and what is the thinnest you plan to cut?
7. What max overall size will the workpiece have?
These queries all help to get the best machine to do the job.