Heres them pictures i was telling you about
This is what the dash board looks like without anything done just took the center section out.
Although you can't see the cabels i was talking about if you have a look at the air con/ heater box one side sits low enough for you to have it down the bottom but as you can see the other side sits far to high and that is as low as that side goes because of the metal cabel resticting it from going any further down. This is why i couldn't bring the air con / heater box down as far as i wanted it as well.
This is a picture of a close up of the metal bar and the air vent that will need to be blocked.
This is a picture of where i blocked the air vent of for this i used an old plastic dvd case and cut out the required shape as you can sort of see in the picture.
Then in this picture i had to seal the unit and make it strong enough so it wouldnt fall out / get blasted out with the air. I originaly used silicon sealent for this same stuff you use arround a bath edge this was pretty strong and held the full blast of the air con however when i put the heaters on the silcon couldnt handel it and lossened from the plastic causing the plastic to fall out. So i then decided the best thing to do was fiberglass it so i did and it was really strong and with held everything its still there till this day lol.
Then came the bit where i had to take out the metal section as you can see the dash was still standing after i took it out.
Then finnaly i tested fitted my screen and it went it perfectly.
Heres a picture of that convertable i was on about see what i mean about the air con / heater unit its different from ours.
Hope this all helps mate.