We have put together a lot of Polywood and this one was the most awkward we have done. 
In the end, we got them put together and they look very nice on our stargazing terrace. 
The placement of the first three bolts underneath connecting the two largest pieces was too close to allow effective turning of the bolts. Doing it by hand with the little hex screw was not enough to firmly hold the pieces together and, lacking the adequate spacing to turn it, would have taken forever. We needed and used a power drill to get them turned and snug enough to hold the chair together. But had to be careful in the tight space to not strip them. That was the main issue, although, as with many Polywood pieces, a bit of wrangling was needed to get some legs and cross pieces in to position.