That Shadow Temple is too good to pass up. Though whats this about dying at the end? I remember something being said about having to jump to avoid that, not sure if it that applies here though.
Akari the link you had for the Vertex Box was dead, so I changed it to the working one that you have on the Das Donkey site. You should probably update the link on smashboards as well.
There are already textures for him, but you could vertex hack him and make him fatter and bulkier, give him big sleeves and large trousers (a full robe is maybe asking too much, I think) with little feet. And maybe remove the cape (if it's possible). It would be awesome.
For Number 2, try taking the FitGKoopa00.pac, renaming it FitKoopa00.pac and putting it in the Bowser folder. It may be glitchy, but it might work. Other things you can try for the lulz are Captain Link (rename FitLink00.pac to FitCaptain00.pac) and Snake Kong (rename FitSnake00.pac to FitDonkey00.pac). The hit boxes are off, but its pretty funny, and creepy, especially with Snake Kong.