Cook macaroni according to package directions; drain and rinse with cold water until completely cool.
In large bowl, combine 2/3 cup of Italian salad dressing, mushrooms, olives and red pepper. Add macaroni and toss well.
Arrange macaroni mixture, tomatoes, artichokes, salami and cheese; chill.
Just before serving, drizzle with remaining dressing.
*Substitution: Use ½ Lb. ziti or medium shell macaroni.