Box creation tool Selection World face snapping sizing during creation is tricky

Along with previous post of trying to create a box aligned with the face of another box, I have found it a bit tricky/frustrating to size the second box correctly.

For example, I quickly run out of mouse travel room to make the box extend "outwards" and hit the edge of the view-port screen and cannot extend further (the mouse travel does not "wrap-around" or keep traveling).

My second instinct was to move over to the Box Height input panel, it does NOT accept input during this sizing specification stage, the up/down buttons beside the input also do NOT work during this stage.

I then accepted the input hoping I could adjust the Height afterwards, this did not work as expected either, the height was adjusted from the center, thus removing my face snapping or pushing the newly created box into/through the first box.

These limitations seem to negate a lot of what would be the advantages of creating a box/shape directly on another box/shape and would lead me to create the 2 shapes separately and then move/snapping them after the fact.

There is a way to achieve that.

Check this video, @1:26.
https://youtu.be/mVRehG-kOQQ

I’m not sure what action you were referring to at that timestamp.
Are you able to list steps?

I have watched over that section a few times but can’t see how it could help my issue.

1. Open Box tool and LMB click and drag out the bottom of the box.
2. Release LMB and move cursor to drag out the height of the box.
3. LMB click to finish the height adjusting.
4. Move cursor over and LMB click the top of the box to select the top section of the box.
5. Use manipulator to adjust the height. Or you can use input value for precise control.
6. Exit Box tool.

Does it work?

I understand now, after the first border is dragged out, I needed to select the face I wanted to drag out and then I could make the adjustments otherwise the input panel would not respond correctly.
It's a bit of tricky one (compared to created a box on it's own without any alignment), but it does work out.

One thing that I have noticed while doing this tool operation, the growth of the shape is inverted to mouse movement.
E.g.
Pulling out the shape (away from the face I am snapping to) pushes the shape inwards and is buried in the face.
Pushing the shape in pulls it outwards in growth away from the face.

One thing that I have noticed while doing this tool operation, the growth of the shape is inverted to mouse movement.
E.g.
Pulling out the shape (away from the face I am snapping to) pushes the shape inwards and is buried in the face.
Pushing the shape in pulls it outwards in growth away from the face.

Try this and see if it's better
https://digitalfossils.com/Download/NVil-Oct-06-24.zip

This is great and much more intuitive.

Thank you very much