The DF Remaster has a high-resolution, true colour version of the in-game PDA interface and all its contents, including the mission briefings.
The assets are contained in the game's lfd\enhanced directory, and images are in PNG format.
Some items are contained in lfd\enhanced\menu and others are contained in lfd\enhanced\dfbrief subfolders. This appears to correspond to DFBRIEF.LFD and MENU.LFD
Enhanced DFBRIEF assets
All of these appear to be rely on the original DELT data in DFBRIEF.LFD for correct positioning on the screen. They appear to be exactly double the dimensions (width and height) of the original DELTs.
Briefing backgrounds
ANIMbrf-jan_0.png- JanANIMbrf-mon_0.png- Mon MothmaANIMbrf-nil_0.png- Jabba
Guns
These are called ANIMguns_#.png with the number corresponding to the DELT number in GUNS.ANIM
Items
These are called ANIMitems_#.png with the number corresponding to the DELT number in ITEMS.ANIM
Briefings
Briefings are called DELTlevelname.PNG corresponding to the original briefing DELTs. They need to have transparent backgrounds to be displayed correctly.
Mission objectives
Mission objectives are found in files called ANIMlevelname_#.PNG where the number corresponds to the DELT number in the original ANIM.
Modding
All of this content appears to be moddable.
If you create a new level with name "mylevel" in JEDI.LVL and BRIEFING.LST, the game will load its briefing and objectives from DELTmylevel.PNG and ANIMmylevel_*.PNG.