'10' Map idea. help please

Hi guys! Kinda new here, but i have this wonderful idea, but it would take me tons of work, and i need some help and suggestions.

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So first off, there are these 10 bedrock rooms, which will get replaced each by other themed rooms.
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and beside them are the themed rooms so like, dirt ice stone ender nether and what not

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and there is this minecart the runs beside these rooms and when activated, the bedrock rooms will slowly change.

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My problem is how to spawn mobs in properly along with the rooms. like how the ice room has special eskimo zombies while the dirt has regular zombies.

Help Please and thanks!
I know this map could turn out great, it seems to have great potential, especially once i add the special mobs and the shops with special items.