Is it possible to use octoprint with a belt printer? If so how?
Yes, it would be possible. OctoPrint just pushes the gcode it is given to the printer.
What may not work is some of the smarter features, for example the gcode viewer will not work, the model size detection and analysis may not work, those types of things.
so what do I put for the bounding box?
would the movement controls work?
That's one of the things that doesn't work. So whatever you enter in there, disable 'Model size detection' under features, and I don't think you should have an issue.
Also, I'm not sure you can use the print continuously feature that Creality offers...