[member="Mara Denko"] It isn't much, but it is honest work.
In a more seriousness sense, I realized something important that I hadn't before.
To begin, Droidekas are over 6 feet tall. They are also shaped like chairs. Giving a rough guess, it can be estimated that the base takes up one foot* and that the top head and armbar takes about two feet*. That means that there is theoretically three feet* of space that a person can sit in. However, Droidekas are typically portrayed as hunched over and, on close examination, there are hinges and joints that would allow the Droideka to stand up straighter. If we assume that the Droideka's standard height is less than 6 feet, the max height when standing straight up straight to its max height let's say that this would increase the seat-able space by roughly a foot*. But wait there's more! By pressing the armbar completely against the headpiece we can assume that space would increase by another foot* as the armbar that was in the way now becomes a headrest for the sitter. Finally, because the headpiece is relatively thin and curved, we can add some more inches of possible headroom to the sitter, which we can generously give as half a foot*. This means, in a generous estimate, that a person sitting on a droideka could have 5 feet 6 inches* of headroom. That is able to fit an average human female, at 5 foot 3 or 4 inches. However, that is sitting straight up. A person who is taller than 5 foot 6 inches could also hunch over or lean to one side, resting on one of the Droideka's arms. This could increase the available sitting space to fit up to, let's say, around 6 feet**, give or take a few inches.
TL;DR - In conclusion, the Droideka is just fancy chair that can carry a person one foot off the ground and it has blaster cannons and a personal shield generator to protect the sitter.
I really want to see this now.
*Droidekas have weird and varying proportions depending on the media, so these numbers are just a guesstimate.
**This is a minimum feasible number that I can guess. The maximum theoretical height could be a lot more.