Minidisc External AA Battery Adapter

This is my first 3D model done in SolidWorks! I wanted to learn how to CAD model since getting a 3D printer so this is a learning experience and practical since there is nothing minidisc related on Thingiverse. It's an adapter for my Sony MZ-R90 and MZ-R900 minidisc players so I can build an external AA battery box (the internal Ni-MH batteries are getting old and have less capacity compared to a AA). Commercially available adapters can be purchased online but cost way too much for what boils down to plastic and bits of metal so why not make my own.

This is a work in progress so I will update this post as it progresses (I plan on adding a top piece, making the bottom a tad thicker, and adding a thumb screw piece to make it easily removable). I've also provided the Solidworks file in case someone wants to modify it for their own project.

Added the models I made for the internal NH-14WM Ni-MH and a AA battery that might be useful in the future.

//*UPDATE*//
I increased the thi