From what I can ascertain, the main visible differences between the 500/501/510 series were engine (not a problem for us) and the props.
Replacing markings I can mostly do, but designing a 2-blade prop and larger spinner (D.500) would be out of my skill zone.
Kacper, that Chinese one DOES look appealing but the camo would be the decider. I'll have a go at it and if you hear frustrated cries coming from the direction of Australia you'll know I'm not doing well at it.
