There are company to help for planning such wedding.
hmm, had you heard of Watabe? The company who took over CHIJMES wedding.
They are one of the company who help client organise oversea wedding.
However it is very pricey. A relative of mine hold a wedding in CHIJMES around 3~4 years back for around $70nett per pax for lunch. I saw from another thread that a table in CHIJMES cost $1400+ with their new event company.
However you might want to check with them if they had packages for location you like.
Another one in thailand is this site:
http://takeustothailand.com
It does look good but it is not cheap to get all your love one there plus their accommodation.