ID:1815989
 
(See the best response by Ter13.)
How do I make it so that the HUD placement is based on how the window is currently sized?
I'll actually be writing a late snippet sunday about this. Stay tuned.
Best response
Snippet Sunday #9 is up! It details the particulars of making a dynamically sized window/map element as well as handling dynamic placement of HUD objects.

It also shows you how to do all of the interface-foo on the client-side to make it more responsive and take a little bit of load off of the server:

http://www.byond.com/forum/?post=1816091