How much would it cost to do a knock down texture and paint a room 870 sq/ft?

Any ideas on how to paint this very high cupola on top of this pool-house. The roof is very steep on both sides and made out of an acrylic plastic, appears, so it would be difficult to even climb. I guess I’ll have to rent a cherry-picker but any other

I have painted my kitchen walls and ceiling several times and after a couple of years I start to see the studs and sheetrock screws bleeding through the paint. I have used Kilz on the ceiling but it still bleeds through over time. This is an old house but this