Nice car bro. I also v spec owner..

haha.

Reverse camera if can, go for the original Honda City Multi Angle Reverse Camera from Honda Thailand (RM1,300)...

Recorder meaning dashcam? Read more here...
https://forum.lowyat.net/index.php?showtopic=2967145
https://forum.lowyat.net/index.php?showtopic=3838148

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[attachmentid=6972954]
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Using the Digital AV adapter connect to car HDMI/USB port.

and you asked at City threads, so the answer is, City is a good choice. Be like my brother, buy booth instead. 

Got a few ways for android...  mirrorlink, mirrorring, miracast, chromecast
I prefer mirrorlink, as I can control the phone from the player.
Yes.. still needed. If not you just can HDMI IN on screen.
Yes you need HDMI and USB.

Make sure your phone is Mirrorlink enabled. For example, Xperia Z2/Z5, HTC M3.
connect bluetooth
connect phone with player using USB cable.
press home, wait until have >>> arrow at the right, touch that..  you should see phone apps if everything ok.
for example
[attachmentid=6980464]
I mean this screen..  only have sound, no video/pic
[attachmentid=6980470]

I cannot say can or not, I don't have samsung to test. Some people say can, but some cannot, just blank in player even after the mirrorlink connected. You may need to download mirrorlink compatible apps.

I say xperia can because, every time someone install bypass with me, I will show the mirrorlink using xperia. HTC M3 is tested at HRV player.
Both Sony and htc can show the whole screen, no need special apps.

I cannot say can or not, I don't have samsung to test. Some people say can, but some cannot, just blank in player even after the mirrorlink connected. You may need to download mirrorlink compatible apps.

I say xperia can because, every time someone install bypass with me, I will show the mirrorlink using xperia. HTC M3 is tested at HRV player.
Both Sony and htc can show the whole screen, no need special apps.

I tried with Note 3 last Sunday, not even detected.