Plus with all mods regardless of their type, you have to test it, test test test over and over just to make sure you have all your codes in a row. With all my mods so far, it takes time to go through the files, find what ones you want, decided where you want them, get them placed, make the necessary code changes, add new codes, and collect all of the loose ends to make even a XML mod to work properly.
It takes time on a mod regardless if its a core mod, script mod or just and XML mod. Out of respect to me and any other modder you should not change something in their mod and upload it for others to download.