Here's a partial wrap piano hinge I found for the top step in my 5.0 when I opened it up for additional storage. The hinge allowed me to use the existing step support fastened to the front wall dividing the step storage from the front compartment and fastened securely to the bottom of the step/lid with a few screws. The hinge made the job so easy that I spent most of my time pulling staples out of the ETI-installed carpet.
I had to buy two hinges and have one left over. I'll bring it to the October Fort Casey gathering if anyone wants it and reminds me.
Ed
Here's a source for a similar hinge:
https://www.rockler.com/brass-plated...ed-piano-hinge