I'll eventually publish some custom sword scripts for Z3 style swords, using stdWeapons, but it'll be a while.
In the interim, if you make a Z3 tileset, and prepare the sword gfx, I'll use them for the demo of the sword script, so you'll get a free Z3 sword out of it.
If you want to work on the Parallel Worlds tileset instead... hint, hint... that would be awesome.
How would sword graphics need to be ripped? HM lets you view sprites, but there is no actual "export" button, so you either have to play the ROM in real time to get the frames screenshoted, or, take screenshots of the editor and remove all extra crap.
Adding in the extra tiles from PW would be cool, but a lot of those objects use different palette structure, and are not fully compatible with original ALttP colors.
EDIT: For the record, you if you don't already, I'd recommend getting HruleMagic, and just looking around the game. It's a neat tool. It works kind of like ZC, but it is more rigid since it is a ROM editor, and not a clone of a game. Also, tile blocks are placed as 32x32 blocks (twice ZC's tile size) so the editor has a lot more "combos" of 2x2 tile combinations. These are editable.
EDIT 2: I was looking through the original ALttP set in the database, and made some notes on proposed changes/ additions I might try to make, if I take this project. To make one thing clear, I would use Orion's as a base, and make it more usable in ZC 2.5 Here's the original documentation, which has a tile page index, and palette information. (kinda long, but the pertinent information is the tile, and palette info)
Here are the changes I intend to make, and stuff I'd add. I would be re-comboing some stuff, and moving tiles around/ getting rid of extra/ uneeded tiles. I would also include an unaltered version of Orion's monumental compilation for reference, and so if people want to see the changes/ maybe use something I changed or took out they can without downloading two zips.
Proposed tile page changes/ additions:
- Expand Link tiles.
- Expand Enemy tiles (might add some ghosted enemies that are found in Z3).
- Simplified ALttP Mountains (Light, and Dark, and maaaaaybe PW if I'm feeling hella motivated).
- Layerable objects?
- More Water Tiles.
- Dynamic/ Better house exterior tiles for ZC use.
- Simplified Tree/ Forest tiles.
- Simplify structures if applicable.
- Add extended floor borders.
- Possibly set up relational borders.
Very general layout proposals:
- Group ALL structures/ entrances together
- Group ALL Light world elements together
- Group ALL Dark world elements together
- Use simplified mountains/ houses/ water as default, move authentic SNES tiles to end group.
Combo/ Tile Page index:
- Link, Sprites, Subscreens, Items
- Enemies
- LW landscapes (Normal, Forest, Eastern Palace Area, Desert, Mountain, River)
- LW Trees
- LW Water
- LW Objects
- DW Landscapes (Normal, Skull Woods, Mountain, Dark Palace Area, Swamp Area, Misery Mire Area, Frozen Area)
- DW Trees
- DW Water
- DW objects
- House Interiors, and Objects.
- Cave interiors, and Objects
- Dungeon walls
- Dungeon Doors
- Dungeon floors
- Dungeon objects
- Dungeon wall decorations/ entrance ways
- Simple Structures
- Full Structures
- NPCs
Other additions:
- New Z3 rules. Changes to sprites/ tiles wil reflect these. (Z3 Link animation, for example).
- Basic pre-loaded scripts for things like signs, and NPCs.
- Reworked 'authentic' Z3 subscreens.
- Possibly add in ghost.zh, and some pre-loaded ALttP enemies (might ask for help with this)
- Extra palettes. Maybe for things like snowy areas, or just variations found in other ZC sets.
This is a WIP list of stuff, and I may have forgot stuff entirely (as I did the caves, and houses when making this list). I'm basically posting this to see if people think it's solid, or have any other ideas. It would be cool to bring the AlttP set up to 2.5 standards. Most of this stuff can be found in newer sets. The biggest hurdle will be making my own simplified DW mountains visually
EDIT 5 million: I was thinking too, I will try to include the big Z3 Link tiles, but I've never ever used large Link tiles, so I might need some help setting these up (instructions, really). Large enemies will not be something I am personally doing, unfortunately. I know it would be awesome, and is probably the most wanted feature from the game besides its scrolling, but I just don't know how to set that kind of stuff up. There are also tons of ALttP rips on TSR that could be used if someone else wanted to script something like big enemies. Most people who rip sprites on there put them up with the intent of people using them for fangames, just make sure you credit those guys 
