Thanks for the compliment. I'm really happy with everything, it came together better than I hoped.
My Pony has a few internal mods, you can see some here (very old pic).
The floor and side are fully lined with MDF, the PSU was replaced with a UK model (and moved to the front) and there's an internal stepdown for the monitor you can't quite see. Doing this gives you ample space to fix things inside.
I was very kindly donated a Taito Type X 1 shell (the bottom half of the case) some years bac, this hosts the motherboard and SSD. This is attached to the side directly (the PCB holders were removed a while back), and my JammASD is bolted to the bottom of the cab behind the PSU.
The SSD was a cheap 64GB one I picked up a few years back and hadn't used. RAM was a 2GB ECC stick left over from my latest HP Microserver build. Motherboard/CPU is as mentioned in this thread. Motherboard is set to boot on power recovery (AC ON) and on any keypress. CPU is overclocked to 4GHz which you do by simply changing a single BIOS setting. Radeon 4350 is flashed with an ATOM-15 modified BIOS (allows the motherboard BIOS/Windows boot screen to display safely).
IIRC CPU £35 (found unused on this forum), motherboard £42, RAM "free" (does anyone have much use for a 2GB stick nowadays?), SSD £25, case "free" - but I did have to buy a (used) TFX PSU for it I managed to find for £10. JammASD £60, Radeon 4350 £10.
It won't be apparent from that video but this build I spent approximately 2 days waking hours on, tweaking and testing stuff. A good chunk of that was spent understanding why things were different from the last time I built one, bashing my head against a wall
Had I gone in blind and followed the available instructions to the letter - dead easy.