Its a Lantern

Based of the design of old railway junction lanterns. But the sidepanels are exchangable and the window panes aswell.
Need scews and nuts and brass inserts. M3x10 24pcs, M5x25, 4pcs, M5 nut, 4pcs, M3 brass insert 24pcs
You can customize the window panes using makerworld but 4 different windows are already included in the download section
https://makerworld.com/de/models/1197843-customizable-lantern#profileId-1210718