Parametric alcove storage unit. I have not yet built this so will update the model when I have ordered the parts, if I need to tweak anything.
By adjusting the parameters you can alter it to fit into the desired space.
It also echos all the dimensions to the console to make it easier to order the pieces.
The trim to the left and right assumes there is a wall to the left of the alcove but not to the right. The filler piece just needs to be moved to the opposite side as needed when building.
This does not include the worktop that would need to be added to the top to finish it off.