I had the same problem. My main sewing table is an Ikea table from my college days. I also had an Ikea knock-off coffee table (yes! Ikea-knock-off! Canadian company called Idomo...)
I took the legs off the coffee table top (simple particle-board-and-laminate), traced my machine's footprint and jigsawed it out, and then added six little legs made of 1.5" wooden dowel to bring it to the height of the bed of my machine when it sits on the Ikea table. To keep the new top from sliding around on the old top I have it anchored with the sticky putty stuff you can buy for putting up posters (I know it as "Sticky-Tac").
I made this top for my old machine whose footprint is slightly different from the one I use now, hence the gap visible in the picture. One bonus of doing this is the very useful space you generate under the new table top - I keep all my accessories there (and some dust...)
Let us know what you decide to do.
Alison
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