Hi,
I have the adjustable seat as I am vertically challenged, so I have it forward, while my passengers usually have theirs back.
I have a cushion too, so I find the comfort level fine. The flap lever is between my legs, and I have the central control column.
The empty weight is around 310kg, but as I weigh only 60kg even with a full 140 litres of fuel (100kg) and 10kg baggage the TOW is 480kg. Could still have a passenger of 100kg and be below 600kg....
HTH,
Neil