Sewing machine bed height

Bit of an unconventional question.

I am a furniture maker currently working on a commission for a sewing machine table and I have a question that is proving hard to Google.

The table is to have an adjustable shelf and cut out for the machines and I want to make it so that it will be able to accommodate pretty much any machine.

My question is, what would the maximum height of a sewing machine bed be from the table? My client has a machine that is 95mm ( 3 3/4" ). I am planning on giving 100mm of space, would I need to go much more than this?

Thanks all.