Hi , 
After accomplished a  mini sound system with 10 " driver i decided to build another smaller  for my new appartement . 
I wanted it full 12 v for make it run with car batterie

So i designed a Rear Loded Horn For 6.5" 

What i build : 
-Woofer
-Multicell Horn (with popstick icecream )
-Amp Rack Remasterised 

What i bought : 
-1910 Gramophone Horn (From France ) 
-1930 TSF radio , additional speaker (it worked but i reloaded it with decent speaker ) 

I like the Dinas phil.  I don't see any fasteners, did you just use glue?

Here the DIY sealed box built with Car subwoofer

-Focal 33KX K2 sub

-Amplifier Dayton SPA 500 DSP cross at 80hz 24dB

-Sealed 20L made with 35mm thick MDF and shape with router 

-DIY Inox spikes and glossy white epoxy 

This work well in the living room !