My 60 refrigerator had 4 large bolts through the refrigerator frame down thru the plywood and then through the chassis/frame. There were little aluminum patches about 2" diameter in the belly pan just below each bolt. I'm guessing you have the same or similar connection (it's kind of a 2 person job). The oven came out fairly easy, can't remember anything special(?) . . . Good Luck.
Aluminumbskull with Led Balloon in Drag
Birch Plywood and Aluminum go together like
Peanut Butter and Chocolate