I'm in the process of painting a bedroom, I decided to remove an existing wall mounted air conditioner and eventually replace it with a split system, once the air conditioner was removed, I had to repair the plaster wall and replace the the opening on the outside, where I had to replace the weatherboards, I decided to replace full lengths of weatherboards instead of patching the aircon hole.
See photos below.
I was on my own whilst doing the installation of the weatherboards, as we are currently still in lockdown so I couldn't get any help to assist to install the boards, so I came up with these weatherboard supports I made up, which worked really good and very useful when installing long weatherboards on your own. I know you can buy manufactured ones, however, I don't do this as a full time job, so I made my own version, I have since made another version, see images below. 

















Weatherboard support fixture/tool Version One



Weatherboard installation tool Version Two














