Project M: Spear Pillar Aesthetic Fixing Help

[SmashBroski]

I'm looking to fix up Project M: Spear Pillar though I have been running into some issues. Here's what I'm trying to fix:

• Palkia's platform textures are those of Dialga's so replace them with those from TENGAN_2.pac
• Awkward pillar sticking out from the bottom-right portion of the stage
• Remove the cavern region from the background; people often think the bottom is still there, SD, and complain
• Have Cresselia only
• Fix Palkia's eye textures (they're missing for some reason)

So far I tried exporting Palkia's platform model and replacing it though in-game, players can't land on said platform. I'm assuming this has to do with CollisionData. I took Brawl Minus's bottom-right portion of the stage and it worked fine though I have no clue how to fix the rest.

Any help would be appreciated.