I am modifying my engine cover to use no hinges- they tear out of the deck. I will use Southco rubber t-handle draw latches with stainless clips. Available on Amazon or Reid supply for less than I paid from McMaster Carr, I think.
I plan on using bits of AZEK (TM) white cellular PVC trim from Home Depot around the sides on the cover side so the metal clip isn't an ankle hazard or deck hazard when the latches are unfastened or the cover is laid on it's side on the deck.
I drilled and tapped some scrap 1/2" thick 5083 aluminum for nut plates. I hate holding onto nylock nuts on one side of the panel when torquing on the other- this is easier and spreads the load. $2.99 assortments of stainless hardware from Harbor Freight (lots of 10-24 screws) finishes it out.