ark is done using brown yarn and chain 30 sts
work one row of sc
then switch to dc and inc 1 st at beg of each row til 36 sts end off the dark brown
to make the section where the door is you need to start out with lightter brown and attach yarn 12th st from the edge. work sc across 12 sts leaving 12 from the end unworked, ch1, turn. work for 3" in either sc or dc and end off by working a row of dark brown.
you can also incorporate a door by using dark yarn in center making a rectangle shape for the door or work this section is the lighter shade of brown. make an overhang on the top 3 rows by vh 3-4 sts at ea end