thx so much for this tool!
if you have some error with localized string, be sure you have edit skyedit.ini
;------------------------------------------------------------------------------; String File Options;------------------------------------------------------------------------------;; Set the language of string files (.STRINGS, .DLSTRINGS, .ILSTRINGS) to load; when loading a mod file with localized strings. The mod filename format is; expected to have the format:;; Filename_LANGUAGE.Strings;StringFileLanguage = English
change english to your language! my spell mod won't work wihtout right localized files.

The structure of .esm .esp files are fully known?