Add a second floor to the shed! :)

Yep, double your space for the same footprint.

If the house is a keeper and you're not going to move then this is what I would be doing.  I saw something similar at the muscle car museum in Tassy.  They have a small cage lift with an electric winch motor to lift the motorbikes up to the second story.  Would be perfect to have games room upstairs, workshop downstairs!