Request for weird non-alignment/scaling issue with my model I can't identify

So - To achieve the model in the attached Blend file, I followed the steps below. My problem is described in a sentence in bold right at the bottom of the following steps:

Scale default cube, extrude it, etc. to get the shape of my house

Turn on auto merge vertices, select parallel edges and press “S”X” (or “Y”) 0 RTN” to get the roof

In object mode, apply all transformations

Select the roof faces and duplicate its and separate it into a new object. Then hide it from view for the time being

Take the edge running around the base of the house, duplicate it, separate it to its own object.

Select the new object and extrude the edge on the Z axis.

Select everything and recalculate outside the normals

Select the bottom edge and scale it on its own axis (“optionS” on MACOS) slightly to model a single clapboard

Apply a solidify modifier, then an array modifier and you get the clapboard siding

Apply a boolean modifier to the clapboard siding using intersect, fast approximation and the original house (default cube) as the intersecting object

Then in edit mode, scale the default cube/base house on its own axis along its own normals (“OptionS” on a Mac) ever so slightly and so that it intersects with the clapboard siding. If you hide the base cube from view now and set the visibility to wireframe in the viewport.

You should now just have the clapboard siding.

> MY PROBLEM
** > when you unhide the roof from view, in theory it should still line up perfectly over the clapboard siding. Then I could apply a solidify modifier.**
** > But the roof is slightly unaligned along the Y or X axis and I don’t know why it is so, or how to fix it perfectly. **

Are you able to help at all please?

house.blend (923.8 KB)

The basic work was not right.
Please watch the lecture carefully. There are many parts that are skipped over without explanation.

Thank you - I was trying to be as brief as possible and intentionally omitted some things. But I’ve watched that lecture 200 times and I can’t worked out what I’ve missed. Could you please explain your image or what it is I have missed, please?

Thank you

What you can see in the image is simply a scale based on the origin.
But in the video, we would have expanded it to Alt+S, not to scale.

The video contains a lot of information, but it is less concentrated.
And the video is not for beginners.

If you don’t fully understand it, you won’t recognize what’s going on in the moment.

Thank you kindly! I found the issue was that I was not holding down Option and scaling - I hit the alt key just once.

Thank you - this resolves the problem

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