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

[JAZZCNC]

Neils bluntness was required here because if you are looking at other builds, esp those built from steel then your not paying attention because you'd have seen NONE are built flimsy regards the Gantry and 99% are done using timing belts and pulleys for connecting to motors. Your design at best is medium duty wood use only.!
Reason for Pulleys is Resonance handling, I'm not getting into how's and why's because it's been covered in many threads so go check some out, But will say it's an important thing on steel framed machines so wouldn't skip it.

Gantry needs to be much more beefed up and braced with plenty of thought to rail alignment and Ballscrew Fixing/adjustment/access. Your design severly lacks here, esp on the Twin axis area. Ballscrew alignment and fixing needs to be strong and easy to setup, if the ballscrew end bearing mounts are flimsy then the screw will resonate which can cause whip and affect performance. If bad then it will also have the similar affect has backlash and causing inaccurecys so design these areas strong and adjustable.
Just remember you have two goals Strength and accurecy, and you can't have one without the other. Build in has much adjustment as possible to allow for the DIY factor, this is KEY to successfull DIY build and stress free build.

Don't be afraid of weight it won't be a problem at this size and will actually give positive affect not negative.

One more note.? . . You've drawn the Gantry bearing plate as Angle iron, this won't be strong enough or accurate enough unless Thick material and prep'd. What you have drawn is has much use as tissue paper.!! . . . The Profiled linear bearings are very intolerent of uneven surfaces and will cause binding if fastened to one. Angle iron isn't flat so it would need surfacing and it will need to be thick material to reduce resonance. Just Fastening to the bench won't stop resonance from weak frame material.
Also beaware it's not a good idea to bolt the machine to the bench unless the bench is perfectly flat and true other wise you'll pull the frame into twist and force the rails out of plane. To be honest this machine won't be light so you won't need to fasten down anyway just level bench and put some buffers to stop machine rocking off the bench.