I guess you want the corner setting to adjust automatically, along with the wall thickness.
But if that’s the case, then I think you need to get rid of it’s current ‘Custom Attribute’ setting, and instead try to assign it a function so it will adjust it’s size relative to the wall thickness variable.
As it stands now adjusting the wall thickness to say ‘4’ reduces the size as expected, and of course the radius corner ends up standing proud of the new wall. However, given that there is also an option for adjusting the corner radius independently, I wouldn’t expect it to shrink proportionately to the wall thickness… as it’s setting hasn’t yet changed.
Changing the corner radius to say ‘8’ does bring it flush with a 4mm wall… and for what it’s worth, I think that works as I would have expected given the settings available on the component options menu.
BUT, of course I also see the logic in having it work the other way.
Having said all this, I’m not sure If you’re looking for help in trying to figure out what the radius forumla needs to be, or if this is a general sort of question which is looking to pinpoint the source of the problem.
you’ve done a nice job so far, and I don’t know if you’d like to try and finish it off on your own???
Pointing one in the right direction, is a bit different than just giving them the solution, so I feel I should be cautious here.