I got this idea from Sean Molloy a local San Diego Porsche mechanic and racer.
Create a slot where the oval hole on the engine lid hinge is. (See pic.)
This allows you to remove the engine lid quickly.
I'd rather store the lid on the car than take up more space in my garage.
Get longer bolts for the brackets on the firewall that attach to the engine lid hinges. Attach the bolt in the reverse direction. Use a washer and a wing nut to attach the hinge to the bracket. (See pic.) Now you can insert and remove the engine lid relatively quickly.