Already been working on it for a few years now in my spare time:
http://valkyrie.sourceforge.net
Go to Source code on the left, then follow download.
The current download is a raw VF-1 with a control system that still needs work (new version coming in the next few months I hope!). So if ya fly it, it's not hard to flip yourself around entirely.
It's not much yet, but orbital will eventually happen. Orbital is actually a lot easier than atmospheric flight, lol. And sorry, no it doesn't transform yet, have to get fighter working, then come Gerwalk, then the one that'll cause real problems, battloid .
BTW, if there are any pilots out there who wanna play test pilot, email me on the site. I work on flight simulators for a living, but I only have but so much time to practicing flying there, hehe.
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Holy crap, thats still alive?