Duplicating Multi-field

Here's the problem...

I'm developing of hotel/motel information website. The end-users want to be able to add all the basic information about their particular accommodation via a single add/edit page. Easy enough so far, a bit of CCK, and most of the fields required are covered.

The tricky bit is that they also want to be able to add information about the various rooms available at each hotel/motel. Each room has multiple fields (no. of beds, price, suite/standard), and they want to be able to add multiple rooms to the one accomodation listing. So, the node has info along the lines of...

-HOTEL
--name
--description
--cck-image[1]
--cck-image[2]
--cck-email
--cck-etc...
--room[1][name]
--room[1][price]
--room[1][beds]
--room[2][name]
--room[2][price]
--room[2][beds]

If it was up to me, I'd be telling them to have a separate content type, and just use nodereference to make the link between the accomodation parent, and the room child. But the client is adamant they want to be able to do all the admin for one accomodation listing via the one admin page.

Ideally, I could create a fieldset that'd work similarly to other CCK fields in that I could define it to behave as a multiple - ie. add one room's details, and a new blank room form appears upon the submission of the first.

But, not sure how to achieve this. Any suggestions welcome.