Wing tip lighting

Starting work on my wingtips and have two questions. First, what is the preferred size screw to attach the clear wing tip cover, the kit comes with #8 nutplates, but these seem too big? Second, preferred method for attaching nav lights. Go all the way with a bonded in metal backing plate with nutplates or just drill the tip and use screws with nyloc nuts?

I just read an article that estimates that four out of five hours of building is actually consumed by planning, and looking for parts and tools!

I drilled my nav lights into the tips and used screws and nuts. Need to have removeable wing tips for this, anchor nuts if permanent tips.

Jekyll