Ability to position (and possibly resize) GUI elements by using X/Y coordinates.

[tux_mark_5]

I recently have been looking for a way to manually position a few GUI elements using X and Y coordinates, but found no exact way to do it.
This would be really useful, as Flows don't really fit in the scheme of things I'm trying to achieve.

Basically, I'm trying to implement a user-customizable GUI that displays various stats (based on signal inputs) from factory via a GUI (think of like movable widgets of an Android launcher).
I'd like to allow users to move and arrange elements in a grid, but not every element is 1x1 in grid-size. As such table doesn't suit my needs.

Also, it would be nice to be able to move a GUI element after it has been already created.

I can also think of a few scenarios where overlapping sprites with transparency would enable to create more interesting GUI elements.