Just to update everyone. I actually engaged the mirror contractor that enriquelee used. It was a quick and pleasant experience. Discussed price over the phone once. He sent his guy to come take measurement one day and then installed within 10 days. Price-wise not the cheapest but he was ok to do my 2 pieces of mirror.

Here are the pics:

I was charged RM850 for 2 pieces.

The measurement is
5' (w) × 4' 6" (h) 1 pc
4'++ (w) x 2'++(h) 1 pc

Both comes with wood panels to support

Hope this helps