I had a bit of trouble with my self at one stage. As far as I’m aware there is no way to get a ‘construction script’ like function in C++. That is a function that is called everytime you move or edit something in the editor.
The best work around is to override the PostEditChangeProperty function. This gets called whenever you edit some property of the actor. You can then call whatever code you need to construct the object from here. You can just add some dummy property to your actor with EditAnywhere, when ever it’s changed your construction function will be called.