You are going at it from the top? How many squares?(The deck is made of squares of plywood). Pull off the carpeting if you haven't already an you can see the squares.
if you have the option of working from below.
you can cut off either the top skin or bottom skin. NOT BOTH!
Top means you have to fair it and paint and do pretty work. But its easy to access.
Bottom means you can do sloppy work but its a hard angle.
Bolt in a peice of angle aluminum across the bottom to reinforce...easy...
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