I spoke to Janne last night. He called Per at the Kommun on Monday who had to admit, to his embarrassment, that the 'new build' map had not been done as promised. Janne expressed his unhappiness with that lack of progress, and lo and behold, he got a call the next day from the kommun's surveyor!
The surveyor showed up on Aspö the day after (Wednesday morning) to make all the measurements and he indicated to Janne that he saw no issues at all.
So Janne will call Per back next week, and Janne is optimistic we'll get somewhere then. Assuming all is OK, Janne will order the electricity and the water pump so we can do the foundations, probably later in May. Phew!