I only have "just" 100 m2 as well. Take a look at the floor plan of the Alto S10 D from Heinz von Heiden. I made some changes to the floor plan on the ground floor to create more storage space. By the way, such a change cost nothing. In the bathroom, I marked the shower as 90x120 with a 2 cm shower tray. In the original, it is 10.20m long; I shortened it to 9.7m, and the eaves overhangs on the roof side are just under 1m, which is what you might have in mind.
Maybe this serves as a small inspiration for your considerations.