Is there any reason* neighbors could not build adjoining Sukkoth?
What I mean is, suppose there were four** row houses, which shared an open patio/courtyard with four** row houses behind them, and this open courtyard could be divided into about a 12x15'** section for each home. Could these neighbors pool their resources together to build adjoining Sukkoth, each sharing a wall (and perhaps even a door) with at least two neighbors?
*I mean any Halachic reason; let's assume all the neighbors are great friends.
**I picked a random number.
(Illustration interpreted from question text)