Lude Generation

Once upon a time, I saw a "How to make a flush tailgate" on a 4th gen 'Lude. Except the guys didn't rip out the plastic trim piece altogether and smooth over the recess, instead the filled in the gap between the surround and the tailgate ..and I can't remember how they did it to prevent it from cracking around the edges etc

from this


to this (well kinda)
please excuse my poor photoshopping..

I want it to look similar to a Supra number plate recess:


I realise it looks a bit odd like that, but I also want to add a lip spoiler instead of the OEM wing.

I expect I'll do it, hate it then scrap it ..but I am looking for evening projects that I can do in the relative warmth and comfort of my living room.

maybe use some kind of flexy filler? pain wopulnt stick though. hmmm.

take it out and weld a piece of metal over it.

Looks like it has a puckered arsehole in that photoshop?

hahaha yeah I'm not much of a photoshopper as you can see! (In fact, I used the Photobucket editing tools hahaha)

I thought maybe take off the number plate and pour loads of fibreglass resin in between the surround and the tailgate hopefully fixing the plastic number plate surround solid, then some more firbeglass in the groove? Would that work or would it eventually break free cracking around the edges?