Is your wooden workshop sitting directly on that exposed concrete base? I am just thinking about water causing you some big problems later if it is.
It siting on tanlised (SP) supports which I'm assured is perfectly OK by numerous people.
LHS and rear wall maintainence might be a problem, roof pitched from back to front and sheeted with ribbed Aluminininium roof panels would have meant a single guttering to clean out of leaves (DAMHIK) on the easy side of the roof, and a more stable covering.
Hindsight is always a great teacher.
Indeed, as is cost and noise when it rains.
LB, proud to be the key board warrior.