Measure your plywood and hardware with a pair of calipers. Tiny differences from the assumed size and the actual size can add up quickly. Lots of plywood is well under the stated thickness. Ball bearing side mount drawer slides behave best if you allow between 1 1/32 to 1 1/16 between the opening and the drawer width. It is far easier to shim or bend the tabs on the case part of the slide to get a perfect fit. If you are using concealed cup type euro hinges measure in millimeters because accurate mounting of the baseplates is crucial.
I like the design you have come up with !
Blum , Grass, Accuride, KV ( Knape & Vogt ), Sugatsune, so many brands make great hardware it really depends on what catagory of hardware you need. Blum makes some of the best concealed self closing drawer slides and concealed hinges. Accuride and KV make a wide range of ball bearing drawer slides. Sugatsune makes a huge variety of stainless hardware for marine and decorative uses.