Hi there and welcome!
I don't like that trimmed brisket cut/pic at all if you are planning to do a smoked brisket like most that you see. One of the crucial parts of a brisket is the fat! That thing not only looks like it is trimmed super lean (other than that great marbling) but you cannot see any fat cap even if it is on the bottom side of the cut... not good.
NOW, I do think that cut of meat has it's place for doing all kinds of stuff BUT I wouldn't smoke that cut unless maybe I was attempting Beef Pastrami.
My advice would be:
- go with the smallest whole packer you can buy (likely much cheaper per pound)
- trim it down nicely (I usually lose about 2-3 pounds of fat alone on a Prime brisket)
- then cut off a large portion of the flat for smoking separately, and PRETEND it is a Chuck Roast (it should behave the same way)
- finally, smoke the left over Point (the best part) and Flat combo like you would smoke a whole packer brisket
- For Reference: I often trim 2-3 pounds of fat alone on a 12 pound Prime Brisket (9 pounds left). You then cut that in half at the flat and you have roughly a 4 pound Flat piece, and a 5 pound Point/Flat piece. After being cooked each cut should shrink enough to be right in the ballpark of what you desire :)
Again this approach would leave you with good fat, 2 cuts of meat you could do separately, be cheaper per pound, and if you get into sausage or snack stick making it would leave you with a great amount of beef fat to use should you freeze it :)
I hope all this info helps!