How to make a stage using a imported model?

[NaiBeatle]

I'm trying to make a Klonoa stage (Keyword: TRYING), but this is my first try making a stage...("making", lul). I want to put it over the stages that I (along with maybe some other people) dislike/don't play on often AND does not have 2 billion hacks on it already (Hanenbow, Frigate Orpheon, The Summit, Sky World)...However, my questions are:

1. Can you add MenSelmapMarks to stages that don't have them? For example, if I wanted to add one to Hanenbow, I'd be able to put MenSelmapMark.31

2. Will the effects still be in the stage?

Someone that's actually a professional hacker should do this instead..