Thank you very much.
I don't have access to a paved runway, so grass is my only option, so I was thinking that keeping the weight as low as possible was the best path to follow.
I would likely skip the cockpit and pilots.
With PC-21 you wouldn't worry about grass runway and take off weight.... Our PC-21 has weight almost 22kg (with 2kg of fuel) and flying unbelievable with K-60TP
http://youtu.be/H-Sw-kVn8Yo