Chunky legs. Thicker is better eh ? No.
Balance and proportion is what makes for a strong user friendly bench. 
This is a working man's bench. It's not a show pony to impress Fine woodwanking magazines editor's.
Follow the logic not the glam spam.
Two identical tenoned frames at either end held together by two long wide stretchers low down for maximum rigidity and support of the storage shelf. The power tools etc are easy to hand and provide ballast.
The lower end rail acts like a sled making it easy to slide the bench around the floor.
The upper rail carries one simple heavy duty bolt to hold down the top.
So despite the heavy weight the bench can be moved easily.
Through tenons all round secured with wedges. Easy. Super stiff and strong.
It is in fact and practice a double trestle.
No upper skirt rail. Don't do that. It gets in the way of using the bench top as a clamping and gluing caul. Make the top out of 2x4 stock laminated together with epoxy glue. Edge up, quarter sawn.
Remember. It's a flat reference surface that will stay flat even if the floor is not perfectly level. Why ? Because the top is only held by one bolt in the middle. This allows the end frames to twist slightly without twisting the bench top. Clever eh ?
Four leg's can't do that.
There will be times when you need that room under the bench top for clamps. Don't make that under surface redundant by putting tool chests etc under it. Keep it clear.
Rubio benches have been bastardised in to a fashion statement not a practical user friendly WORKING bench.
It's your gig if you want to go that route. I save my best work for the customers and my home. Besides which I work my bench hard and it gets glue snot, paint and oil finish splats on it.
It's not a piece of furniture. I can't work fast and efficiently if I'm worried about scratching it, getting it dirty or damaging the inlays. Plus you don't want your chisels banging around underneath when your hammering something on top. Its bound to damage them.
Copy it by all means. Then get it doing what a proper bench is supposed to do.
How long did it take me to make this one ?
Four day's.
Is it still beautiful and impressive ?
Fk yeah ! IMHO.
PS. Give your self generous over hangs at the main vice end. You will be amazed at how often you end up clamping to it.
You are most welcome.
Cheers m'dears. 🍻
How much do you Bench ?
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