There are just not enough
straight lines. That
is the problem.
Nothing is flat
or parallel. Beams
balance crookedly on supports
thrust off the vertical.
Nails clutch at open seams.
The whole structure leans dangerously
towards the miraculous.
Into this rough frame,
The  personification  of ‘Nails clutch’ give the reader a sense of the desperation of the community. These shacks could give way any time. 
 The fact that the seams are ‘open’ suggests lack of protection, bareness and vulnerability, like their lives.
Living Space