Open framed hatch...how to finish inset taillights?

I mounted the taillights and license plate holder on the back of the SlumberMAX this weekend...the lights and plate I chose needed to be drilled into the hatch, which has exposed spars...
So now on the underside of the hatch...I've got unsightly holes and bolts sticking through. I'm sure my wiring expertise will add to the beauty of what is sure to look like a mess...
So...for those open spar hatch builders...how did you finish? Or did you? I'd like some elegant inspiration here...please oh please...Pics would be appreciated!!!

So now on the underside of the hatch...I've got unsightly holes and bolts sticking through. I'm sure my wiring expertise will add to the beauty of what is sure to look like a mess...

So...for those open spar hatch builders...how did you finish? Or did you? I'd like some elegant inspiration here...please oh please...Pics would be appreciated!!!