[Outwest34au]

I have made a fibreglass recess for my filler cap (RHS rear gaurd), got some ally pipe bead rolled to weld into the tank for a filler but thought I better check before I went any further.
I am planning on using bead rolled exhaust tube for the actual connecting pipe but due to the placement of the cap it will be exposed in the wheel well.
In the event of a tyre failure it could be open to damage from debris. Is this fittment allowable? or can it have to have a cover skin to protect it?

I have seen others that come straight into the boot and are not exposed in the wheel well and now I am wondering if I have got it wrong?

Any advice or criticism welcomed.