Rels for Castle Siege and lylat to stgcustom

[Kurth]

Sorry for the noobish question but I've been able to add stages using rel files and PW's stage roster expansion before but for some reason stages based on Castle Siege load a black stage (sometimes with a floor, sometimes without) and stages based on Lylat don't load at all. Since they work over their original stage and the rels are the correct ones, I'm at a as to how to fix it. Hopefully someone a little more knowledgeable will be able to point out what I'm doing wrong (the name of the rels perhaps?).
Thanks in advance.

[GanonZack]

Castle Siege and Lylat Cruise can't be put on custom stages, because they change of "stage" in mid-game when you're fighting

[Kurth]

Ah, so that's why! I still find it odd that you can get stgcustom.rel files for it when they don't work. Oh well, thanks for explaining.