My husband did this for me several years ago.

The new machines are not designed to fold into the cabinet like the old ones where.

You need a shelf inside the opening to hold the machine.

The opening for the old machine may need to be enlarged for your new machine.

There are plexiglass inserts you can buy that fit your sewing machine and this will cover the opening (they can be opened when need be).

http://www.allbrands.com/products/abp03040-0074.html