Nice project ,if your using it as a new man cave for modeling I would recommend you insulate the walls and add an inner layer of wall. This will benefit you all year round and be very useful for keeping a constant temperature if your going to be painting in there too.

Also consider adding double glazing, power and heating for the winter months.

that look like a ton of fun Ken .Although with your history of modifying your models I am surprised you havent added a turret or clock tower to the shed

Carl

A thought Ken...
Did you wood-treat the outside of the panels up against the fence?

Factory shed treatment is notoriously naff and you don't want the bottoms of your panels starting to go soggy after a few years.

Also, I wouldn't use plasterboard in a shed. It will absorb moisture from the air and start to swell at the edges.
A cheap carpet on the floor makes a big difference to keeping it warmer too.

Have fun.

Roy.