Ouch, sorry ; I had completely forgotten that you need the TE4 Modding SDK to do that, and I still didn't create it...

(I got the flu so my brain kinda meltdown these last few days

)
So once it'll be released, you'll be able to follow the instructions above.
I might not do it before a couple of months, though, as I have to stabilize many things before (else Mods will stop to work when I need to change stuff).