In general I prefer to design and make free-standing pieces of furniture: there is more scope for playing with shapes and proportions.
But there are circumstances when fitted furniture is definitely the way to go.
3.2m x 2.5m
Although I have to admit that some projects do push the capacity of our workshop to the limit
2.7m x 2.4m
under the eaves of a loft conversion
Oak, Painted MDF