My fuel filler hose and vent hose were both dry cracking. I ordered new parts and just put them in. Having said that, In my case, I would not concern myself by hiding that angled cover seeing that the hoses will outlast my bus or I. The floor cutout where the fuel filler hose emerges was touching the hose so I took an adjustable wrench and used it to bend up the floor edge to keep it from cutting into the hose. That may help you too. Pull the cover off, inspect for chafing, cracking or loose clamps. If all is well, I would think it is good enough to cover it up in your build.
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--Simon
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