Sierra Style Dialog Questions

[Salzi]

Hey guys, me again. I've been searching through the forums and figured it might be easier to just ask.

I am trying to customize the position of the Sierra Style with background dialog, the whole thing, portrait and textbox. Right now it's awkwardly stuck in the middle of the screen.
Is it possible to determine the position of the dialog on the screen?
Note that this is not about the dialog options box, but the one that the answers are displayed in.

For a workaround, I tried setting the text box to a GUI (not a text GUI but a normal one) in general settings (custom text-window GUI) , but when loading up the game it stops loading and gives me an error message ("GUI set as text-window but is not actually a text-window GUI"... which makes sense).
My question: Can I use a normal GUI to display the text down in a Sierra-Style dialog? I think for positioning, this would work the best.

Also, since I am already here, another question: Is there a way to determine the maximal width and height of a Sierra Style dialog box?

Cheers!