A SG5 for a mATX, it would work...

[Edward78]

So the Sugo SG5 is shoebox size... It is easy to carry around, great for lan parties... Wide as a SG1 (maybe a bit wider for a 5th slot for a double slot GPU to be in the last PCIe slot on the MB) anyway so you arn't limited by the smaller boards...

 

[Regack]

I used to have a Silverstone Sugo SG05, I think you'll be 20-30mm too narrow to fit a microATX board in there. I'm patiently waiting for the Kimera Nova.

 

[confusis]

SG05 is 222 mm wide. Minus 10mm or so for panel fitment and whatnot, even with modding you'd be limited to a 212mm board. Standard m-atx is 244x244mm.