Wood movement

I am building a new work bench and due to monetary constraints I am building the top from Premium grade pine 2X4’s jointed, planed and cut to 1 5/16×2” and I will be turning each one on it’s side (1 5/16th up), I would like to put an alder bread board edge and band it with alder. The top is 23 inches wide or so and I am planning on three tenons on each end a 2” then a 4” and then another 2” and they will all be 3/4” thick. Can I make a tight mortise and glue all the tenons or should I just glue the middle and float the other two, or cut the mortises at 2 1/4”, 4 1/4”, 2 1/4” and the glue it solid? I’ve never done this before so am worried that all the time to flatten and mill the lumber will come for naught as it warps and checks. Any help – thanks.

-- RickM