Unfortunately, it was designed using OnShape. The workspace is public, though, so you're welcome to clone and make modifications as needed! If you're just adding the SSD on top of the hat, I believe the `#piheight` variable will add more height/space to the back, then it should be exportable as `.3mf` or `.step`, and a few other formats (but not `.f3d`, unfortunately). You might also be able to import the `.step` uploaded here into Fusion and modify as needed (I think you should be able to just stretch the back to make space), or export the workspace in a different format that works better for import. Hope this helps. Feel free to upload the modified version here (just make sure to indicate it as a remix!) if you do!