Nice solid bench AZ, but if you need general benches, that are easy to build, and light to move around you might want to have a peek at this product.
WBSK Workbench and Shelving Hardware Kit
@&%$, I don't know why I can't get an active link to work here, but maybe its better that they don't. You can search "Simpson Strong Tie Bench Kit"... should take you right to the page. I have some that I bought for $20.00 ea. so the pricing can vary a LOT. There is a Youtube video of a guy building "something" with the kit and he did a horrible job of his demonstration, so don't use that as a reference at all! If you follow the guidelines inside the box, they are very sturdy. (Basically, use clamps before screwing it all together)
I built some out of Western Red Cedar for outdoors and some of spruce for shelving in the garage 2"X4" and 2"X3"... make 'em whatever size you need and as many shelves as you need... simply put, they are the cats ass.
Mr. Administrator might consider using these guys as a relevant ad sponsor...