You want to hide wiring? Is it in conduit or armored cable? Exposed wiring is illegal in the US...sounds like you are in another country? So if getting the wires behind the wall can't happen, putting it in extruded metal tubing (EMT or conduit) is a safer option. Then embrace the necessity and go for a hi-tech/industrial look. Reclaimed and re-imagined furnishings and parts from factories and workshops to play up the look. Search "industrial" under the "browse rooms" tab in the Houzz header. Regarding hiding switches...hiding them is not so great...you kind of want them accessible when stumbling about in the dark! The EMT electrical system has metal boxes for mounting switches, outlets and light fixtures. And metal cover plates too.

The interior posts didn't get attached.

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Hello ramarao, This is the outline furniture plan of your given layout. Some measurements needs to be rechecked. If you can do some structural changes like the door from the drawing room to some other room and few minor changes, we can plan it better.