I noticed in the volume 4 thread that only four people filled out the poll. If more of you are still reading along or catching up (or reading at your own pace), maybe you can fill it out too. It will be motivating to keep going 
Possibly useful: @Belthazar shared the following link to the Wikipedia page on the Boshu dialect, which has a word list (under 主な語彙) that might help decipher some of the speech: 房州弁 - Wikipedia
And to motivate all of you to keep going: volume 4 has quite an intriguing chapter about something that we haven’t seen before 
By the way, if anyone has questions or comments on the previous volumes: don’t hold back. I’m still up for any discussions 