I guess this will be similar to the answer to "How long is a piece of string?"
I have only seen a few VIP 155's around Asia, but they vary from the basic VIP from the factory to a VIP with a throne fitted mid cabin. As in a regal throne. Seriously impressive, but only the designer knows its mass.
I suggest a call to Eurocopter. They may not give you a direct answer but they may give you enough information to be able to work it out for yourself.