i used steel from smoothie fab. i used glass fenders. everything fit great. I used fender welt between boards and apron. originally just felt was used at the ends. . I have nothing there now, but may put it in. Smoothie sent support bkts. and said to attach with liquid nail? I tried that but endwed up mig welding. watch for dimples. I would liked to have put plywood under the boards full length for better support as they do give when nstepped on in areas other then where the bkts. are. Over time tis could cause a depression in the board.
Good luck on your choice.