Since we started with the Wedge Challenge, I used that as a start:
Which took a couple of tries to get the rotation down as I still can’t keep track of when positive or negative:
Making the cube:
Then trying to center it on the wedge via Transform, Object, Origin. I was not successful:
So resorted to the old fashioned method of inputting the coordinates:
I decided to go with moving the vertices, to keep how to do that in mind, to extend the cube:
Duplicating and positioning the top wedge:
Joined the objects:
I had to bang around a bit to get the Origin Point to the bottom but finally got it on the 4th attempt:
Et violà at 0,0,0: