I would do gray walls and just make sure it has the same undertone as the tile I often paint the ceiling the same as the walls if going with a light color or if a little darker for walls I cut wall color 50% for the ceiling. I have a gray and mostly white LR and I have walls a color called Vancouver Day from C2 I then add color for different times of the year with pillows and a few accessories The wall behind the sofas I just painted in a purple from one of the pieces of art and I love it.

Let your wooden beam be as it is. put your Led lights in the other direction ( two on each side in one rectangle , so the total will be 16 units of say 10 watt each Led.), as to balance the horizontal and vertical shape. Don't put anything on the wooden beam to retain its the beauty.

Firstly I would like to tell you that there are alternative materials to prevent rodents n pests (false ceiling) Ramco,s Hilux, Bison panel zykron fiber cement boards Please do visit the websites of above ...

I was going to suggest the same thing as InspiredHome. Fix the false ceiling no more than 6 inches from the true ceiling. However you would have to drop the height of your wardrobe loft shutters, otherwise you will not be able to open them once the ceiling in place.. You can leave the carcass as it is, but replace the the shutters with a fixed panel from ceiling to about 8 inches below, and smaller shutters in the remaining space. The false ceiling can stop at the fixed panel above. That way you will not lose loft space