I draw a lot and make many small models, and this takes up space. I have found that the cheapest way to store drawings is if I draw on A4 copy paper as I can discard the sketches I don’t like, the pages photocopy easily and I can also very easily organised the pages into a folder to store and present.
The small models on the other hand are tricky as for a final exhibition with my university course I will need to keep them to be displayed. So right now I have a shelf dedicated to my small models and a tub filled with neatly organised sketches.
The plan for the models will be to photograph them in a lighting box so that they are properly recorded and can be discarded at a later date, to make space for new projects.