Links updated on the first post.
Post again if links go down or pm me. Thanks.
@Esn: I haven't played around with this in a long time so I don't remember if I ever got the stages working but I did however manage to change the screenpack. You have to swap a bunch of files and SP items to get it to work, essentially you are just modifying the original MUGEN itself so basically you are creating you own SP. Again I haven't messed with this in a long time and if it doesn't work with the current CFW that is out then you'll have to use a downgraded 1.5 or wait till I figure it out. If you want post your info, current CFW and such and I will see if I have time to figure it out and post a fix if you need one. Peace.