Errr, he didn't say he *LINED* the inside of the walls, he said he *FRAMED* inside the shed. ("Uprights every 2-3 feet")
I read that as meaning he put a wooden "skeleton" inside the shed, which strengthened it, and gave him a framework to hang stuff off.
Lining a shed with 80*55 timbers would have been an interesting exercise:confused:
Cheers,
Andrew