What they should have done was had the bottom floor of the tower as a storage room with a "Spiral staircase" going to the second floor which would be the actual enchanting room. Also the towers should only have 1 door at the bottom level.
Another bad design is that a lot of role players may not like that fact that the enchanting room is directly connected to the childrens room. Yeahh that's great for them sleeping at night, listening to potions and cauldrons bubbling and seeing troll skulls and daedra hearts laying out.
P.s Bethesda - People would love your games/DLC if you didn't TRY to limit them on everything. You just HAD to make each wing have 3 seperate options, instead of picking what each wing is out of a list of options. Maybe some people would like to have an armory with kitchen + Green house. trophy room is stupid and storage is pointless. Little advice for next time, instead of over thinking everything, just make things more simple, and in return people will have more options and be happier overall.