For whom it may concern (or has interest), there have been a number of improvements made to the SBA code that are currently available on github and if I can get the instructions properly updated will be provided to ZC as an updated plugin.

The code is written/provided to support ZC 1.5.1, 1.5.3, 1.5.4, and 1.5.5(all "versions) (haven't tried applying it against 1.6.0 yet). Features that are/have been addressed:
- The potteryhouse/jeking created Simple SBA dropdown option now shows up as an option in the Option Names catalog area. This option supports display of Out-Of-Stock attributes that are the only selectable dropdown and also with populating with the remaining quantity of the particular attribute inside of the dropdown area.
- If a product has one dropdown and multiple Read-Only attributes, then the Simple SBA dropdown will remain functional a an option.
- If a product has more than one dropdown then Dynamic Dropdowns will be considered for use unless there are other attribute types like file uploads, text entry boxes, read-only, or check boxes. If any of those are offered as an attribute to the product then Dynamic Dropdowns will be turned off for that product (until further developed to work better with it all).
- File uploads are now supported, and there is an option in the includes/extra_cart_actions file that will allow creating a duplicate of an uploaded file if/when using other software such as product attribute grid where it may be desired to have the same file upload applied to each "version" of the product when uploaded all at once.
- When the Simple SBA dropdown option is in use, attribute images now properly swap with the main image. The attribute images can be displayed along with the attributes like the standard design suggests, they can be shown as normally and allowed to switch out with the main image, or they can be set to simply swap with the main image. Image swapping is not yet factored in for product with multiple attributes, but a full scheme is coming soon.
- Added an observer for the shopping cart to swap the image in the shopping cart display if it meets the criteria for swapping on the product info page.

- Admin, in the SBA menu, entering a text search provides a response that is now editable. If the text search results in only one item from the dropdown then the dropdown is updated to show the information for the searched item.
- Modified some of the code to use more of ZC's functions to support future upgrade compatibility.
- Began combining functions into a class instead of being stand alone functions that may not be related to the rest of ZC.
- Began working a method of retrieving the customid from hitorical sales records instead of live/current database records.
- Attributes Controller now has a link on it such that if attributes are applied to a product then clicking on the link will take to the SBA admin screen with the product activated for manipulation.
- Files requiring some form of modification have reduced significantly with ZC 1.5.5 and continue to search for ways to reduce the code changes needed.

- Verified that it is possible for Dynamic Price Updater to work with SBA provided a few modifications are made to DPU for it to play nicely with other jQuery/javascript.

Current installation "path" is to:
rename YOUR_TEMPLATE folders to match the folder name of your template,
then install all of the files that are in the includes and the admin folder of the download,
then to navigate to the folder for your version of ZC
and upload the files in the includes and admin folders there (rename folders with YOUR_TEMPLATE here as well).
Then in admin once logged in goto the following file and install/upgrade, existing variants will remain, but your SBA settings will be reset to the default values.

Thought I would throw that out there in case anyone had interest, was curious etc. Welcome further input now that all of the built in attribute types are supported at least for a basic set of options. Working on version identification as well...

Software is currently available from github at https://github.com/mc12345678/Stock_...butes_Combined or as a zip file by this link: https://github.com/mc12345678/Stock_...ive/master.zip