How to I install a shower head?

[Andeh]

I'm building an outdoor shower. The things you do when you've finished building a house.... 😁

 

I've bought a kit online, and am assuming a 1/2" thread to 15mm John guest pipework for the actual water works.

 

However, the rain head is just the shower head, arm with I presume 1/2" male thread.... Then nothing?

 

What part do I need to connect this to the John guest fittings, and also surface mount to hold the rain head? 

 

Pic attached, on the right you can see the large bar to hold the shower head, terminating in just a male thread. 

 

Second pic is the woodwork, stood vertical, which I eventually want it all installed on/behind.

 

Thanks!

Edited 5 hours ago by Andeh

[Nestor]

You need a 90' wall plate elbow fitting.

Have a look here

https://www.screwfix.com/search?search=wall+plate+elbow

[Nickfromwales]

Or 

 

[Andeh]

Perfect, thanks guys!.. Would 1/2" be a sensible estimation of the thread on all the kit?