I have heard that too @Biahi - that eventually people in Paradise will lose their genders and genitals.
Back to the subject of this thread though and I have heard it said by several knowledgeable elders that the Bethels and indeed Kingdom Halls are full of Brothers and Sisters who have the skills to do anything, from manufacturing mechanical and electrical products to upgrading water dams, forestry, you name it.
Me, I'm fully POMO and very sceptical about this idea, though.