FYI, a few things have been updated in the files for SBA to further it's operation/use.

1. SBA now supports upload files as an attribute.
2. If Products Attributes Grid is being used (as recently updated) and upload of files is an attribute, there are two options with regards to the file(s) associated with the multiple product generated. Either one file is created on successful upload for each upload file and that file applies to all product generated from each of the grid products, or a copy of that file can be made such that each product has an associated image (permits the store owner to further modify each image independently). This option is currently controlled by the $renumber variable in includes/extra_cart_actions/stock_by_attributes.php. Set to true (current default), and the image associated with the specific upload file attribute for every product generated through Product Grid attributes will be provided a unique file (duplicate content of the original) and associated information for the uploaded file. Set to false and a single instance of the uploaded file (again one file for each upload file option) will exist and all grid product will use/reference the one image.
3. A few admin logging actions have been added that were not previously included associated with installation.
4. A change was incorporated that corrected an issue with attribute comments when using Dynamic Dropdowns.

There's still other improvements to be made; however, the overall functionality of SBA has come a long way thanks to the work of potteryhouse, jeking, and those before them.