gas filler help

anyone got anyidea on what i can do here

i puzzled myself for days no that exact matter. there is no way to make it look that good. break down and buy a fuel cell or sheetmetal the floor and raise it up. thats what i did, then got a flush mount pop up gas cap and now its a thousand times better.

well i was looking at geting a pup up one but how do you line it up with th filler on the tank or conn. it with the tank