Tools
Three things that were quicker to build than to keep explaining.
All of it runs in your browser. Nothing is uploaded, and each tool checks its output against the same rules the plugin applies at startup.
Sigil item builder
Fill in the fields, add abilities, and lay the recipe out on the station a player would craft it at. Read off the file that belongs in items/<namespace>/<id>.yml. Every key it writes is a key Sigil reads. Keep a whole set here and craft one out of another; open the ones you already have to edit them.
HoloPanels view builder
Add panels, set their offsets and watch a scale drawing of the board update. Offsets are the fiddliest part of a view, and this is faster than nudging one in game. Keep several here and the actions that open a view will offer them.
Config checker
Parses an item, view or boards file and reports the same categories the plugins do: errors that stop it working, warnings where it loaded differently than written, and gates where the server version is the limit. An item or a view can go straight from here into its builder.