The other oops has to do with the rain gutter in the Milan. I made the second side which was a bit different in shape to the first side. I ended up liking the second shape better so I am now changing the first one. Same process as above but a lot smaller mould.
The beige coloured material in the cut out is the change in the shape. I straightened out the shape so it more closely matches the shape of the hatch opening. Not a lot of change but right and left sides were different enough to bug me.
The Milan has been sitting outside in the rain for a few days and the rain gutters work as planned. I did end up adding some drain holes in the floor so any other water that gets in can drain away.