connect thos breps (bbx)

hi folks

i'm a total beginner and my englisch isn't that well so i don't realy now what i have to searche for to resolve my probleme.

i've got these spiral "buildings" and i wnat to patch a voronoi on it to create a lamp with voronoi pattern. my tutor told me to connect them but i don´t realy know what funktion i have to use.

at the end there should be a corpus.