Good job! Loved josephs build, too, and made a somewhat similar build like that myself back in the day (though with full ATX PSU).. Used a jigsaw for the bottom hole and it looked more like a potato than a circular but it helped a lot with temperatures.
Lone Industries L2 or L3, not quite sure. At the moment he's got not cases left to sell but at some point in time he might reconsider producing another batch.
There are also a few threads about his cases here.
Going to name a few which fit most of your requirements as far as I can see:
Sharkoon QB One
BitFenix Colossus M Mini-ITX
Fractal Design Core 500
Phanteks Enthoo Evolv ITX
Fractal Design Define Nano S
They fit a 240mm radioator, some even GPUs up to 330mm in length and PSU size is for most...
My first build in my Ncase was a Seasonic X560 together with a Samuel 17 on the CPU and an MSI GTX 760 ITX. No space problems at all. I actually found cable management to be a lot easier with my ATX PSU than with my later SFX-L adoption. Due to the sheer size of the ATX PSU you could just stow...