Thanks for the kind commet!
Well we actually take planes from boxes and boosters... No problem for that. But there are more urgent subjects for Series 4: Se5a, Sopwith Triplane, Pfalz D.III, Hanriot HD.1, a German two-seater somehow more modern than the Roland... DH2, E.III, Nieuport 11, Halberstadt D.III and/or Morane Saulnier N could be a great Series 5 anyway.
As far as the 1000th Camel is concerned... Great scheme, even if we usually prefer to depict war machines that took service at the front. We can see for Series 84 (when we will have the 100th miniature subject...

).