Before you do too much with elephants, consider that the HTW team did something very unusual with cavalry... I'm not sure why, but basically all the HTW cav is made as 'riders', mounted on to a single transparent pixel. It could be because of all the chariot teams they included, using up all the 'horse' folders. Anyway, it confuses matter somewhat...

To be honest I'm not bothered about having different crews - different elephants would be a nice luxury IF we had spare folders, but for now the one elephant in two different scales for Indian and African will suffice. (I tested out the different scales, and it works fine )

As DtS said, some uniticons are from HTW - in the screenshot above, the three on the left are mine, the three (well one, really...) on the right is from HTW. As for slinger actions, well, it should be possible to make some room in some of the BIFs with a bit of juggling.