Im new, am a 3D designer. Need a New cnc machine and need advice and guidance

[JAZZCNC]

You are weakening the machine having that base like that and it's completely not needed. You need to keep the gantry sides height to a minimum and your creating 60mm more than needed and every bit helps if your wanting to cut aluminium.
If you want the best strength then having raised sides with rails on top with gantry sat directly on bearings is massively strong and much much more suited to an all round machine. If your wanting to cut aluminium then you WILL need 2 ballscrews on the axis moving gantry. This is not just an opinion it's hard learnt and tested thru building many differant machine designs trying to find the best design for an all round machine without being silly about design.

The machine your building with single screws will be fine for mostly wood use and occasional light duty Aluminium work but have no doubts it won't handle cutting aluminium correctly and give quality finish. At a minimum you'll need 2 ballscrews moving gantry to stand any chance and very beefy gantry.

Edit: Oh and the bed base needs far more supports than just one in middle.