Could be a spacer put in place to stop the door from vibrating, as it may not have been closing tightly.

Try some clear plastic table cloths. I think bunnings haveit, cut it size and it should provide a non slip solution

You are carrying out structural alterations, so you will definitely need a building permit. Thus you will need it to be designed and signed off by an engineer and include…

I personally would remove the little section of wall between the window and arched doorway completely to open the whole space up. Then bring it down to bench level as…

1) and 2) When you ask what types of driveways there are, it seems you are mixing up terminology, between construction methods and finishing. There is one universal method to…