newbie from bristol soon to be up and running

[Jonathan]

i will be cutting ply ,mdf, softwood

That's good, since the machine will just be able to cut those, but nothing harder. I asked because there are a couple concerning things about your current design:

The unsupported rails on two of the axes will significantly reduce the rigidity of the machine, see here for a detailed explanation as to why. To start with you might as well try the machine with them, but I'll be surprised if you don't swap them for supported rails in a few months.

It looks like you haven't put any angular contact bearings on one end of the leadscrew and that you're possibly using the motors to resist axial forces on the screw? If so you need to change this before running on the machine, as standard 'deep groove' bearings are not designed to work with axial forces, so they will quickly fail in addition to adding end-float to the screw. If you use a pair of angular contact bearings that wont be a problem. Look up the standard end-machining for ballscrews and it should be fairly obvious how to proceed.

What pitch screws have you used on the longest axis and how long are they? The critical speed/whipping might be a problem.