What exactly is the design? Not just what labels are there, but what are you doing that makes hooking/docking appealing, and what are the limits that need to be set for them? What you want to do is very possible, but there is more than one way to do it, and that's just from you've said, which may not include all of what you're really trying to get done.

Easiest, but maybe not the best, depending on what you need, is to hook a module into a label, then dock to the label. If the module is to be resized, set the label to resize the module on resize, and resize the label for it (Ex: VWMBoxOnResize !ParseEvars !vwmsize %#VWMBoxCurrentWidth%# %#VWMBoxCurrentHeight%#).