Not at all! The walls are to be entirely yours to design. It's your decision where the windows go, so make the windows and fill in the rest with stone bricks (if you need cobble, you can take a few stacks from the chest in my tower).
So do what you want with the walls. I've just left blank frames for you to fill in as you wish. They're your part of the project, and when they're done we can discuss together what remains to be finished and who will do what.
Make windows of any size and shape you want; I've just made an outline for you to go inside; lines for you to colour inside, as it were. The extra space, fill in with stone bricks. If you want me to take a hand in the walls, say so, but I've done loads and we did say we'd do this together, so unless you want otherwise, they're yours to do.
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