This happens to me occasionally too. It doesn't impact the .brsar as far as I'm concerned unless you attempt to modify the .brsar with Sawndz while the .brsar is opened
Make a folder called "brawlmods" in the root of your SD card and make a folder called "custom1". There are other folders too, but they are built for specific mods (bbrawl is for balanced brawl, brawlplus is for Brawl +) Put your .gct file in that folder. Basically, the .XML file itself tells you how you should name your folders.
Do you have codehandler.bin? It should go in the riivolution folder
Unfortunately, I went through that problem myself. It seems that you have to go through the game in order to unlock some songs. I suggest you beat the Subspace Emissary and collect all CDs, then use the cheat.
I'm completely new to rigging models and I got all my info from this tutorial (and the other by Beyond). I have no problems so far importing a Baby Luigi model from Mario Kart Wii over Luigi other than slight distortion in the arms and scale size to fit the bones.
My problem occurs into rigging the model. Baby Luigi already has bones that I deleted from Mario Kart Wii, so he mostly rigs fine (well, in my view) when it comes to bending his arm (the right one specifically). However, a distortion occurs in the side of the cap and the face where the arm is. I don't know how to fix this...I tried decreasing the weight of the vertices affected and no improvements occur and the red areas affected by it seem to stay that color. Please help, I would greatly appreciate it.