Based on the screenshot and assuming a 44x33mm sensor I've done some approximate measurements:
Body is 135x82x22mm (plus viewfinder and lens mount bump). The mount builds about 7mm, but the sensor can't be too deep into the body either to fit the back screen, so I'd guess the flange distance is around 20mm.
For comparison, Sony A7r: 127 x 94 x 48 mm (bumps included), so the Hassy is similar in size. Flange distance is probably in the same range too, so it looks good for adaptability.