Actually, I'm curious to test it out. Testing reveals some issues. Particularly I've found an issue regarding Axem's UI (Journal/System Viewer), which needs to be ported to support this; I've said earlier.
The Options UI is a mess, though, but it's cool.
Editing the rocket-ui.cfg replaces the screens in the game states as stated in the code below:
#State Replacement
$State: GS_STATE_INITIAL_PLAYER_SELECT
+Markup: data/interface/markup/pilot_select.rml
$State: GS_STATE_BARRACKS_MENU
+Markup: data/interface/markup/barracks.rml
$State: GS_STATE_OPTIONS_MENU
+Markup: data/interface/markup/options.rml
$State: GS_STATE_TECH_MENU
+Markup: data/interface/markup/tech.rml
$State: GS_STATE_SIMULATOR_ROOM
+Markup: data/interface/markup/simulator_room.rml
$State: GS_STATE_VIEW_CUTSCENES
+Markup: data/interface/markup/view_cutscenes.rml
$State: GS_STATE_CREDITS
+Markup: data/interface/markup/tech.rml
$State: GS_STATE_LOAD_MISSION_MENU
+Markup: data/interface/markup/load_mission.rml
$State: GS_STATE_BRIEFING
+Markup: data/interface/markup/briefing.rml
$State: GS_STATE_SHIP_SELECT
+Markup: data/interface/markup/ship_select.rml
$State: GS_STATE_WEAPON_SELECT
+Markup: data/interface/markup/weapon_select.rml
$State: GS_STATE_DEBRIEF
+Markup: data/interface/markup/debrief.rml
#End
Screens replaced include at the moment: tech room description, simulator room, view cutscenes, credits, loading screen, briefing, ship select, weapon select, and debrief. I look amazed.
ngld's right. As stated on the WiP post on Shattered Stars, the demo will not use this. Its development version uses it currently, but I'd like to develop high-resolutions screens specific to the mod.