Another limitation is the small varchar sizes for @TableName, @ClusterKeyName and ClusteredIndexNames. You should use sysname instead of varchar(50) and varchar(75). This will also make the script usable international.

Also tablename, indexname, columnname, should be escaped by using QUOTENAME, I have inherited multiple databases with spaces, dots and other special characters in object names. I betting others have to.

Otherwise a nice script, which can come in handy