Great. Then we can now return to the important things. If we now reduce the bungalow to 150m² of living space and later expand the attic, it doesn't look so bad. Forget about the wedding. That means you can imagine that the bungalow will work again? Or do you have concerns just because of the plot?
The bungalow floor plan variants discussed so far all still require modifications and their not entirely trivial integration into the plot and building envelope - I see little overlap between these measures and a developer project - having a "Stadtvilla" placed there would seem to me a far less bold wish.