When merging do not EVER overwrite files, windows will add numbers to distinguish so keep em in the same merged folder. Simply copy the PAKs you wanna use, change format to ZIp, extract to folders, merge all once you got the folder structure right by reading the link i put above. I installed winmerge, have it on my right button menu.
I personally opted for a do it for me because mod mergers are too much of a trouble for something so simple as merging folders and solve minor conflicts between XML files. How about you Pak your group of mods yourself?