Help needed with functional layout of a small exhibition building

Hi everyone,
I'm currently working on the concept design for a small exhibition building located next to a city park in Białystok, Poland. The site borders the park on the south and west sides, and I'm trying to figure out the most efficient and logical functional layout for the building. I’d love to get some feedback or suggestions.

Here’s some context:

– The building is a simple rectangle, 32.6 meters long and 11.4 meters wide, with the long sides facing north and south.

– There are three entrances: from the south, east, and west sides. The main entrance is from the south, slightly offset to the right.

– No vestibules or lobbies – I’m planning to use air curtains to preserve internal conditions without disrupting the open feel of the space.

– The building is free to enter (no ticketing/cashier zone).

– Toilets will be fully accessible and unisex (OZN standard in Poland).

– There will be a small cloakroom near the entrance, a reception area, and open exhibition space at the core.

– At the back (north side) I’m placing technical rooms – a storage/magazine, staff room, and small office/administration.

– The building will be connected to an outdoor exhibition area, located near the south and west façades, which will be seasonal – it can be used in warm months and folded away or protected during winter.

I'm trying to maintain openness and flexibility but also need functional zoning. I’ve made a few rough sketches (including floor plans), but I’m not fully convinced by the circulation or proportions yet.

Have you worked on something similar or have any ideas how to balance open exhibition space with support functions in a building this narrow?