Here is a preliminary map of the lower level.

Just enough will be kept, but with changes. Yes, it will confuse the players and their characters. That is the idea.

I have marked off the area for the bit that lifts upwards, and there is a lever there, in the down position.

Here are three areas I'm working on.

Do you map below this new remark ? The passageway doesn't slope all of the time.

In one in six chance the passageway lowers.

And this one. The spiral stair on the left only goes partway up to the ceiling. The one on the right goes part way into he water, but not down to the lower level.

The red arrow down stairs comes down from the ceiling. I might make it a folding stair, not visible from the main level.

I think I'll redo all stairs so they are CSUAC.

Sorry, I thought I had fixed the map's name in the Ice Cave route.

I looked closer, all of the strip sheets have blur or something else on them. I took that off, and now I can see the map more clearly.

My condolences.