Can i replace the shafts of the cnc with longer one for increasing the workspace, will the software and other things still be compatible?
No. It’s definitely not as simple as you’re thinking it is.
Indeed, only you can answer that question. How mechanically capable and competent are you to undertake such a modification? Onefinity is correct in their statement that it perhaps isn’t as easy or cheap as you might think it is. How much travel are you looking to add? Have you looked at the X-50 Journeyman upgrade?