Features

Display multiple leaderboard tabs at the same time (e.g. production tab, units tab, etc.) image
Advanced information on the resourcepanel such as upgrades, worker count, army supply, workers lost, army value and more
Customisable on-the-fly with hotkeys to toggle UI elements on or off
Hotkey to hide commandcard and move unit infopanel to the right image
Minimalistic theme that eliminates empty spaces
keeps the standard layout and takes away nothing
Leaderboard (production tab, etc.) is still fully interactive, you can click icons and use mouse to change between tabs image
Clear selection button moved to a more logical location
Possible to toggle background for resourcepanel to make it more easily readable + Show Spoiler +
Menu button, help button and social button moved next to minimap
Shows map name above the minimap
Also compatible with non-1v1 or even some arcade games with certain limitations
Compatible with any replay or live game from SC2 WoL, HotS or Starter Edition patch 2.0 (february 2013) and newer


Install instructions

Place the file you downloaded to this folder: 
Windows: /My Documents/Starcraft II/Interfaces/[Here]
Mac: users/(username)/library/application support/blizzard/Starcraft II/Interfaces/[Here]

In SC2 go to options -> gameplay and select "Standard Enhanced" from the Observer Interface drop down menu + Show Spoiler +


Things to note

Current worker count is not to be confused with worker supply (worker supply would be worker count + workers in production). This is why worker count + army supply =/= used supply.
Army supply count is exactly what it says, meaning it represents army units on the map + army units in production, the same way the standard supply count works (units on map + units in production)
Army value (in minerals or gas) however doesn't include units in production
Unit repair cost is not shown in army value, however when a repaired unit is lost, it does appear in army units lost in value (unit does go more expensive when repaired, but the cost is added once the unit is lost)
Workers lost count is actually workers-killed-by-opponent count
Units lost tab, is also actually units-killed-by-opponent tab. This means that manually detonated banelings, banelings detonated against structures or any units killed by friendly fire, direct or splash, aren't shown. Also note that since this feature was enabled by blizzard with patch 2.0.10. (late july 2013), this tab will not work when using replays from previous patches.
User can not be assigned to a player slot when using resume from replay feature (blizzard's design choice) + Show Spoiler +
I can not change any of these due to limitations with interface mods. All these numbers are pulled from the game, I only have control over where they are placed on the screen.


Bugs

Archons, regardless of which templars they are made from, are always considered to cost 100/300 as if they were made from two high templars (blizzard's bug)
Army value count has another blizzard's bug with archons, that templars stay there as "zombies", for exaple let's say you make an archon from two dark templars, your army value is increased by 100/300 without subtracting the dark templars even when archon is killed (was my mistake, redownload file to apply fix, sorry for inconvenience)


Hotkey guide

Use these hotkeys to toggle UI elements on or off. All the default hotkeys follow the combination of Shift+[a specific key]. Below is a chart which shows how the hotkeys are laid out on a standard QWERTY keyboard and list of all hotkeys with UI elements that each of them controls. If you wish to customise hotkeys or change what's on and what's off by default when you load a map scroll down to settings section.
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Shift+W - Hides entire UI

Shift+R - Resourcepanel

Shift+T - Additional structures tab (1v1 only)

Shift+U - Additional units tab (1v1 only)

Shift+O - replay controls and player POV selection

Shift+G - upgrades (1v1 only)

Shift+L - Units lost tab (1v1 only)

Shift+X - Unit portrait

Shift+C - Controlgroups

Shift+V - hides commandcard and moves infopanel to the right

Shift+B - Resourcepanel background

Shift+N - Map name

Shift+M - Buttons next to minimap (menu, ping, etc.)


Default hotkeys are set up very similarily to Starcraft II's default english hotkeys. For instance "Shift+U" opens the additional units tab, and "U" is the blizzard's hotkey to set the leaderboard to display the units tab (image: + Show Spoiler +). Also "Shift+W" is used to hide the entire GameUI, which is similar to blizzard's "Control+W" hotkey, as well as "Shift+O", which is used in blizzard's interface files to do the same thing as it does here - hide observer panel. All other hotkeys are laid out to the bottom row of the QWERTY keyboard to make it easier to try all of them in case the user happens to forget one.


Settings

You can use __SETTINGS.SC2layout file to customise which UI elements are on or off by default and hotkeys that toggle them. The file is contained within the interface file. You can access it by following these steps.
Open the interface file in the SC2 editor
navigate to the UI module (a button in the top middle)
when the UI editor pops, select __SETTINGS file (the top most file on the left hand side file list)
make neccesary modifications on the right hand side panel

Be sure to follow the instructions there (green text). Also don't forget to save.

Enjoy,

Priidrik