I am doing almost the same requirement as you, still awaiting for the price quote.
But my additional items were relocating 1 bathroom and building another bathroom.
Someone told me this wuld cost RM20K or more ..
But mine is single story house so hopefully would be cheaper.

Any idea how much is pebbles wash stones? I saw some designs, which uses this pebbles wash
but heard it wud crack if expose to hot sun too much.

Also, the green type of windows .. heard it is very exp too !! Darn ..