The FS2004 project is a Golden Age biplane fighter. I don't whether it is advisable to commence now or await the FS X SDK.
In the meantime work resumed on the Sopwith Snipe over the Easter Weekend. This is for CFS3. Whether it will be up to Biff standards remains to be seen. To date there has only been a couple of weeks all up on the Snipe compared to the Biff, which was a multi facited learning exercise and involved 7 out of the past 12 months.