I made this last night and was very impressed; a few variations though:
Cooked the shrimp on the BBQ. I tossed them in a paste of paprika, cayenne, salt, smashed garlic clove, lemon juice and olive oil.
Also, I cooked the pasta four minutes, added the green beans (not an asparagus fan), after another two minutes added the pepper slices and peas and cooked another three minutes.
I used greek yogurt and didn't have a problem with it curdling.