My first mod that provides large single-character signs has been released 🙂
https://www.curseforge.com/minecraft/mc-mods/large-iron-sign
#Large Iron Sign
fringe birch
bronze oracle
cool, I like the connected borders.
I think it would be a nice quality of life feature if you could place down a bunch of them side by side, shift right click the first one and start typing like you can with regular signs