Need help of someone experimented with REL modification

[pîkachuk]

I'd like to port BrawlEx to PAL
I beginned to work on the port by myself
Now there is some problems, it's easy to make the link and making the PAL common2.pac loading the bx_fighter.rel but i wonder how PW managed to make the bx_fighter.rel cause it contains SO MUCH relocations to others assembly that it seems impossible to be made manually
a decompiler/recompiler has probably been used in this case or the official revolution SDK but i've not enough informations, i would have need to get infos from someone who is experimented at REL modding, it would be really useful if i find one to know how i should proceed to find a doable way to port the offsets an easier way