From the late 1600's , through the 1700's, and indeed later still into the early 1800's, it was quite common to 'read up' upon the 'latest style' in architecture in what would come to be called 'magazine's.
These people didn't just flick through the pages of these 'magazines' thinking *maybe tomorrow* they actually used them - much in the same way that most of us won't use that recipe by Yotam Ottolenghi we saw in the Guardian that one time that looked really tasty but had, like, about 200 ingredients but we knew in our heart of hearts that someone, somewhere, would bite that bullet. They would source those ingredients and follow those steps.They would follow Ottolenghi's recipe to the letter. They would wonder after all that effort why what they had made was such a bag of shit that didn't look anything like what was in the magazine
Such is the 'history' of a building such as this.
In the absence of Nick Knowles - who wouldn't be invented for some number of years - people would use these 'style guides', which were often quite complicated - sort of in the same way that today you might buy 3,000 magazines to build a Ford Mustang replica which would end up costing a great deal more than you would be prepared to pay for such a thing up front - to build their homes and/or businesses.in the 'current style'.
More often than not, the result of these 'custom' builds would result in what experts usually describe as 'a bag of old wank'. We have all had 'enough' of experts.
Tbf to the ^builders, they bequeath to us buildings that are quite evidently structurally sound. This is, in most cases, all they have going for them.