Your chickens are going to love that mulberry tree! And they will keep the area cleaned up for you, since mulberries can be so messy.
Blueberries adapt better than you might think. They are very shallow rooted, so you don't have to dig deep to amend, other than they like a well-draining soil with some humus to it. You can use garden sulfur to adjust your pH easily (take the pH of your existing soil and apply according to directions). I only have to add it every couple of years. Mulch them heavily with a wood chip mulch and they should be very happy. If you have hardpan soil or a low wet spot, you may be ahead to do a raised bed though.
Not sure the scale of your drawing, but you'll want to make sure your fire pit is well away from your trees, since the heat rising can scorch them.
I recommend Ozark Beauty (everbearing) and Sparkle (June-bearing) strawberries for their good disease resistance. The U-picks plant several different varieties to extend the season. Heritage is a dependable raspberry. I have Blueray, Bluecrop, Patriot and Northland blueberries. They are a little different in their fruit size, ripening times and growth habits, with Patriot and Bluecrop being my favorites, but you'll want at least 2 varieties for good pollination which yields bigger berries. Your ag extension agent will have info (or see if you can find your ag extension's website) for what varieties do best in your area. Some areas have different disease pressures, although you and I are nearly in the same hardiness zone.