Thanks but I'm still missing something. I cant get this to work yet.
I have a segment (a box for the wall) 3 splines (1 for path, 1 for wall height, 1 for window cutouts), and feeding those into an Array 2s
I stick the segment (box) into the Default of the Array. Works sort of as expected. The wall scales along the path, but vertically the box repeats to fill the height. OK well ok(ish) so far.
The window holes are cutout, not perpendicular, but same as before when I had the Linear 1S.
1) Using the trick you mention with Extend XY and Auto Align, results in the wall dissappearing. No matter what mode I enter for Auto Align: None, X--XY, Spline all result in same thing. As soon as Extend XY is ticked, the wall vanishes.
2) Can I also scale the "box" vertically like it does across the path? (for now I'm cheating by just making the box larger)