LCAM-01XA
Full Access Member
You should actually give the top side a slight slope down forward, you don't want rain water trying to collect up there rusting your masterpiece away. As long as there is some texture for your boots or whatever to grip on you will be able to stand on it to work on the engine. As much as I hate diamond plate for automotive use, this is one application that it is very good for. Or you could use smooth steel, and lay some skateboard grip tape on top of it, achieves the same thing.