How much of the electronic equipment should be accessable after completing an aircraft? Should I have a hatch adjacent to the receiver?

Can I put the fuel fill tube in the location as the real a/c? (I should put my project in my sig. so I don't have to keep repeating myself) Its an FW 190 which I think had the fill tube exit behind the cockpit like the ME 109. And what of the radio receiver? Can I put that where the real a/c would've had the pilot's radio? Or should I stick to the plans?
Thanks.