Dear Spinaltap,
I got Audinni to build me a bespoke cabinet based on their Solid Quattro line. I had them adjust the middle part of the cabinet to be just the right width for a DSP5200HC. They also pre-installed the bottom part of an alphason bracket for my 55in screen (now replaced with 65in). Wife ( & cats ) love it.
See Audinni Soldid Quattro AV Cabinet & Alphason Unifit bracket
I'll upload photos if anyone's interested.
GMS

#1: StormAudioISPEliteMk1;DSP5K2/5K2HC/D33x6/D2500;RoonRock/Tidal
RegaPlanar3/RB250/Carbon/NADPP2;SonyTCK850es;CaCXUHD;CaAzure651T;GoogleTV; FireTV4KMax;AppleTV4k;Virgin360/Philips 65OLED950;SonosArc
#2: 562v2;DSP5K;FireTV;SonyBDPS3700;CAAzure640T
Spare: 568.2mm (faulty);596s;DSP5000C;M60C;Explorer2;G68ADV;