The factory C/8 model has a single long bench seat on each side that folds up to accomodate the stretcher cases - you'll notice the folded seat behind the stretchers in most photos. The reason you usually only see one side with stretchers is because there's no walking room in the middle if both seats are folded and four stretchers are loaded, and also because each vehicle was equipped with only two stretchers. These photos show how it would look with no modification:
The rail-like structure that supports the legs of the lower stretcher folds in half to stow under the seat. You can see the folding joint in this photo:
There's also a fold-up 1-man seat at the end of each bench so the medics have somewhere to sit even if they do carry four stretchers.
On the field-converted models, a fixed wooden bench on the left and stretcher cases on the right seems to have been the popular configuration, and the factory models with folding seats were probably used the same way because it was what everyone was used to.
You'll see how it all works when I build my model. I've been toying with the idea of casting all the parts since I've successfully made my own resin parts before, but this would be a much more difficult project that any casting I've previously attempted...and of course as soon as I finish making a conversion, Dragon will come out with a superiour plastic kit ![Wink [;)]](/emoticons/icon_smile_wink.gif)