I only used a single barracks to complete this map. I did it a fair while ago, but it wasn't that difficult once you are started. A number of sav files of the city at various stages of completion are included here.
Very impressive use of forced walkers. Normally I'm not too impressed by goodsquad's cities because of the use of tent ghettos to max out population. But no tents (except as labor draws) here! Wow!