Audi 80 HIFI conversion to begin HELP

Hi, I now want to miss a little sound from Fr to So my Audi. I have a 2-way system from Rainbow 16cm for the front, a coax system from Rainbow 16,5 as rearfill and an amplifier. I have the following problems: 1. I bought doorboards. How do I get the door panel down to replace these with the original stows? 2. I want to mount the amplifier under the hat rack and have LS on the hat rack, yes I know LS on the hat rack = Sch***e, etc., di e but will serve as a rearfill. My questions about this. How do I get the cable channel on the door sills? 3. How do I get the holes in the hat rack? I hope you can help me. MfG kuenzelde