I have uploaded the blue spiny shell here:
http://www.mediafire.com/?zwuncznminf
Note: The common3.pac I've uploaded is PAL and maybe don't work on NTSC. To get it working open BrawlBox, extract the ModelData[0] and the AnimationData[0] from the directory ItmSmashBallBrres (ARC) and replace it on a NTSC common3.pac.
Tutorial to get the mario kart wii model working on SSBB:
1 - The files of MKWii are in .szs format and you need SZS modifier (created by Chadsoft) to extract the Brres you want (for example: koura_red, togezo_koura, etc)
2 - Once you have the desired Brres, follow the instruction of RandomTBush posted on this thread:
http://www.smashboards.com/showthread.php?t=263127
3 - And the last step is to get the other games Chr0 animations working in BrawlBox. I done this:
a - Download the latest version of Brawl Box (v0.63d) (credit to Kryal for making this awesome program)
b - Click on the Chr0 animation yo want to preview and yo will see four fields: FrameCount, Unknown1, Unknown2, Unknown3. Fill unknown1, 2 and 3 with 0 (although sometimes the field Unknown2 can be filled with 1 when you are working on animated stages for instance) and fill the FrameCount field with a high number (500 for example). Give a name to the animation (rename it as you want) and know go to the model (.mdl0), right click --> preview
c - See when the animation ends. You can look a bone that changes constantly, you can note this because when a animation ends this bone jave almost all his parameters (X, Y, Z translation, etc) in yellow and reduce the FrameCount to the final frame number (in case of Blue Spiny Shell the end is frame 60).
Enjoy
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
and sorry for my bad english and for my probably bad explanation.
Edit: I had forgotten that the blue spiny shell appear too big in game (10 times bigger than in the screenshots taken by me) and you'll need a code that makes smash ball smaller. Sorry I have tried to resize the main bone to 0.25 but it didn't work :S