Guidance required. Pioneer app radio

[P15UL T]

Hey guys. I've started stripping out my centre console to install the pioneer App radio SPH-DA100 ( I know this isn't the current model). I've had it sitting here for a while.  

 

I've also got the double din surround, gps wiring, patch lead for steering wheel controls, cable to connect to iPhone (old style not lightening connector) 

 

ive came across a few issues that I could do with some clarification on

 

does the cage fit inside the existing stereo brackets ?  It seems really tight but if I remove them there is no where for the cage to fix too ? 

 

My car is a standard car so so no bose or steering wheel controls. I now do have the steering wheel controls on my new steering wheel. Is it possible to get them to work as o have the patch cables for the stereo ? 

 

And the big question. Will this stereo work with my current iPhone 6s if I get a lightning cable adapter to connect to the old style iPhone cable of the stereo ?

 

thanks for any help 

Paul