That plastic [fiberglass] grating is expensive and so is Aluminum.
Cheap = wood.
If you wanted to make it yourself, check at Lowe's or Home Depot at the cost of aluminum angle iron, flat bar and 1/4" sheeting.
You probably could figure out a way to make something bolted together to fit your boat. Depending on how wide your boat is, you would probably need a couple of vertical braces to support your weight.
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