The Mrs has downsized from a Mazda CX-7 2.3 Petrol, to an 08 Renault Megan 1.6 4 door. She actually really likes the Megane

Part of the 'deal' was I would uprate the CD-Player so that it would
Have Blutooth for her Iphone for calls and music
Optionally have USB to play music from
Optionally, but she really would like this, have SAT NAV built in.
Has anybody done this, any suggestions etc?
I've never changed a factory fitted one for something else before. but have changed from ISO to ISO ones before.
So far, the parts I think I need are
1. metal rods to get old stero out
2. Renault to ISO loom/wires
3. 'facia plate' or similar. now this I'm not so sure on, the SAT NAV radios on ebay all seem to be BIG, can I fit this in?
4. possibly some adapter for the radio aieral
this looks good, but really, no idea! https://www.ebay.co.uk/itm/Renault-Megan ... 51b49c52fa
anybody done this, suggestions for replacement?
any help appreciated.