de spoiler questions [rear panel)

Just ripped the rear standard spoiler off my slicktop and have welded up holes 6 round ones on tailgate.

1 once the perpex panel is fitted can it be removed without damage

2how much have peolpe payed to prep and paint there tailgate mine is eh7 pearl yellow so going to be expensive

3 im i right in thinking the perpex panel fits into the 3 sqaure holes in the recess looks like there should be 4 holes

4 the panel with the brake light in is this led or can you change the bulbs as normal

5 do i need to buy any clips or are the part of the panel

thanks TAFF