A new model representing the Lockheed Constellation 1049H series can be found here:
http://ltts.crlt.indiana.edu/grn/flightgear/
Please note that this is far from a finished aircraft. There is much left to be done and many problems left to be resolved or re-worked, but it's my first Flightgear effort and I hope it is enjoyable in its current state. The model has been tested for FG 1.0 and 1.9, but may not work for bleeding-edge CVS users due to changes in the JSBsim FDM. I haven't had time to deal with that issue yet but I'll get around to it. If you download the model, please take a moment to view the README file included with the distribution, as it contains important and useful notes on the model.
I would also like to invite everyone interested in the Constellation to check out Yakko's guide to flying the 1049H model, also found on the same site noted above. He gave it a wonderful treatment.
Thank you and cheers to everyone who has helped or supported me on this project!