My husband built me a lovely sewing room. I have my serger centered between my computerized machine and my power Singer. I can slide between all three depending on the project I'm working on.

Two of my machines are on "lifts". When the machines are down for storage, I cover the holes with stiff mylar plastic sheeting. I have also attached a portable "swing away" task light under my sewing surface. I swing it into place in one of the lift openings and have have an instant light box without the need for a separate box to store.

Also, it's helpful to have electrical plugs installed at counter height for using craft tools. Extremely handy if you plan on using your sewing surface for any crafting projects...no need to bend over or hunt behind sewing tables looking for an outlet. Of course, power strips mounted on your work surface work as well!!