#16 looks like either the lid to a crate, or a trapdoor, but I haven't been able to find it on Playmodb under either word search.
#18 looks like part of a window, the hinges to the top left as we see it.
Could we see #9 from a differene angle? It looks like a small winch handle, possibly from a modern boat set.
#6, again hard to see from this angle, but is it a hook, offset from the centre of the bar?
# 10, could we see this held by a klicky? It looks like a handle to something, possibly in the construction theme which favours bright colours, but I'm not sure which bit the klicky can get their hand round.