That looks real nice! Bob does a great job of putting chinese inspired directions for a greenhouse together! probably helps that he is just smart in those areas anyway! You are going to SOOOOOP enjoy the greenhouse! I can picture you sitting in it with a cup of hot tea reveling in the green luxury in the dead of winter!
Yes. Whatever height that work benches are set, you need stools to match.
A special location must be assigned for setting your cuppa. Also, a wall hanger needs to be installed. You will arrive from the cold outdoors, dressed for winter. It won't take long before the shedding of outer layers begin. My shed-attached hoophouse has very tempting space for a hammock.
You know that you shouldn't deny yourself these sorts of comfort. The entire purpose for the enterprise is to create a comfortable environment. Living creatures - plants and otherwise.