The 707 is my favorite plane of all time. I love the CS model but feel that it didn't get what it deserved in FSX and hope it gets it in P3D. I would like to see an INS from CS like the another company DC-8 and CS L-1011 have. I would also like to see other varients. Please Please do a 707-120 and 720!!! Also Captain Sim, Please do a Convair 880. The 880 hasn't been done by anyone except HJG. Seriously though, We have the 737-100 expansion, we need a 707-100 expansion as well!

CS 707 is a favourite of mine as well. Used to use it in FSX-SE with triple Simufly INS and later with the ISG FMS.

Check out the General Discussion thread. P3DV4 upgrades list on the first post appears to be actively updated and has changed a few times in the last few years, but not long ago the 707 appeared as "in progress" for P3DV4, and a few days ago this changed to "standby".

Of course this could change again to something less promising but for 707 enthusiasts this is interesting.