We're just sort of making it up as we go in my studio, but I started with the idea of using unfinished kitchen cabinet/drawer units from Home Depot as the legs.
I wondered out loud to my significant other if it would be possible to use them in that fashion and it's turned out well. He used stain grade plywood to make the work surface and a piano hinge in order to lift the top (there's a two x four "ladder" on the back wall that I can use to "prop" the table top up at various angles).
It turned out to be heavier than expected, so he added a counter weight that runs up into the attic.
I know I'm not explaining this well, and I'm sorry that I can't show you sketches (no digital camera or scanner at this time - I always have to borrow them).
There is an old pic from about a year ago in the studio layout post (on page 4 or 5 I think). This pic really only shows the drawer unit "legs" before the main top was added, but it might give you a place to start.
I've ended up with a work surface that is 3 feet deep and 5 feet across along with 8 drawers within easy reach of my chair (although the room is not finished yet, so I'm still working with portable items - sketchbooks and a french easel). If I remember correctly, the unfinished cabinet/drawer units are about 36" high to begin with, so the top will be at least 3/4" higher. Mine is about 2" higher.
Like I said, we did a lot of "making it up" on the fly...so it's probable that there are better design ideas. I'm fairly certain that we would do some things different if we were starting over from scratch (like find a way to make the top lighter - part of the heaviness came from an early mistake).
I started out with rough ideas of what I wanted in a studio, mostly lots of work surface, and lots of various types of storage space, along with areas specifically designed for certain tasks. I also wanted it to be beautiful in an "old world" way, warm and interesting. I definitely wanted to avoid anything that looked industrial. There's a celtic knot/oak tree theme running throughout.
Anyway, although I couldn't provide you with specific plans, I hope this might spark some ideas for you.