Hello Romainpek,
The Graeme Bantock WEE NIP design is an interpretation to fit within STRATHCLYDE class RC yacht rules.
Yes 2.2kg is on the heavy side but the class rules stipulate that the total mass of the rigged hull should not be less than 2kg, therefore I was reasonably satisfied with my result. (Page 3 of rules)
I don't have any competition out here (Invercargill, New Zealand) yet so not a problem. If I was over your side of the world with a lot more "sailors" they I would, I think, carry on like all competative yachties the world over, and sticking within the parameters of the rules becomes a hot topic.
Can't be bothered with Protest Committees etc. myself so it suits me fine to be the only one and like you I sail to enjoy it. Watching the kids find themselves making it go with out a motor is as much a reward as building it was.
Good sailing, Cheers, Bob