Leafs on the ends? One of those things that sound like a good idea but after the novelty wears off, in maybe 5 minutes, they'll either be always up or always down.
Wheels? Anything sufficiently heavy as to require wheels to be moved is questionable. But if you must have them, make damn sure they lock or you'll be chasing your table all around your shop.
Under a table has to be the worst possible place to store stuff that you might use more than once a century. Far better to put stuff you actually use on top of surfaces, not underneath them.
Nothing brings out ideas that appear to be good but in reality are worthless like building a work table. Go for simple. Leave then underneath empty, you'll end up putting all manner of things you never use under there. Again, keep it simple. Bells and whistles seldom get run or blown once the novelty wears off and moving parts are merely things that can break.
The best table I've ever had, and the one I still use to this day, is a 3x8 banquet table [$100 plus or minus] purchased at any Staples, Office Depot, whatever with a 4x8 piece of 3/4" MDO screwed to the top and a cutting sheet with grid printed on it on top of that. It's sturdy enough to hold anything I've ever put on top of it, from truck tailgates to rolls of media requiring two people to lift, yet light enough to grab an end and move it to wherever strikes your fancy. I wouldn't trade it for any table I've ever seen or heard about in these or any other waters.