My wife and I recently built this farmhouse table with her grandpa. It was a lot of fun and we are really happy with how it turned out. The table is 80 inches long, 43 1/2 inches wide, and 31 inches tall. The extensions are 15 inches long and 43/1/2 inches wide, and the bench is 61 inches long, 15 inches wide, and 19 1/2 inches tall.
It tooks us about 4 weekends (around 32 hours) to finish the project and the included rebuilding the base of the table after our first one cracked.
We modified the plans a bit. We used 4x4s instead of glued together 2x4s for the legs on the table and bench.
We also used the plans on this blog (http://tommyandellie.com/?p=2582) as a guide.
This was the first time my wife and I have tired a DIY project and we had a ton of fun. Her grandpa had some experience with wood working and had all of the tools we needed but you can certainly do this without any extensive wood working experience.
Then we added two coats of stain of a custom mixed stain from Sherman Williams. We started with the Wood Classic Rustic Gray. The store then tinted until we found the color that we liked. Note - the table looks grayer in person than it does in some of the photos.
Finally we applied 3 coats of minwax water based oil modified semi-gloss polyurethane.