How to deal with the gap between the cabinet and the balcony window can not be built into the wall

For this, it's best to ask about the property. If they approve. That's it. Renovated by yourself. If not, it is a load-bearing wall, it is not possible.

The wall under the balcony window can be played, and it does not belong to the load-bearing wall. >>>More

You can install window protective nets, and the kind of stainless steel that extends outwards can dry the quilt.

You are living on the upper floors and are put! To be honest, it's best not to install plastic steel, change it to broken bridge aluminum, although it is a little more expensive, it is strong. >>>More

It is best not to use square steel, because even if the weld is painted, it is easy to rust in the future, so it is better to use aluminum alloy.