Opinions on this router design

[JAZZCNC]

Ok well I hardly anything wrong here just a few pointers gained from building the design you've copied.

First keep the gantry sides don't get rid of them as you want them to lock and locate the profile but like Routercnc says they will be better sat direct on the bearing plates thou you'll need 2 plates to do this. One fastens to bearings and the other is bolted to gantry which bolts to bearing plate. Doing this gives you more adjustabilty as well has strength as you can loosen or shim the top plate to aid squaring and setting up if needed.
Also put the gantry sides on the out side and make it one piece that drops down so ballscrew fastens to it. This gets rid of that brace which won't be needed now and the profile sits directly on and above bearings giving better direct loadings etc.
One thing with your design having profile on inside is that it doesn't leave much room at the rear for everything to fit and not clash. It will fit I know that 100% because my router design(see pic) uses it in same way but it's very close but if you use suggestion above the profile is that bit longer and you have more room for switches etc.

With the Y/Z axis then I'd flip the motor and ballscrew mount to other side. Couple of reasons for this, You can make the ballnut bracket support larger which makes it stiffer. The way you have the brace means it's very short due to the ballnut flange so doesn't give much support, if you flip to other side you gain about 10mm in length which makes a differance. Also make the drop bracket out of thicker plate 20mm minimum.
Other reason is cable routing it just makes running cable chain and wires runs shorter and more fluid.
Wouldn't bolt the plate that holds motor from top instead bolt from front has it will support the Y axis rear plate better and make it from thicker material ideally 15mm minimum 12mm. If you use 15mm you won't need the little upright support which will be a pain to fasten.


With the base then you'll need to brace those sides with triangle plates or supports at each end else they could vibrate which will show in cut.
Like Routercnc says you'll need to beef the motor mounts etc and looking at your model I think your short on the ballscrew length be careful not to try to work to fine on screw/rail lengths as it's very easy to miss calculate and run short of your target cutting area.