Just saw this thread, and wanted to let you guys know that this project is on my list of things to do!

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I acquired the 44 Magnum M-29 Kit, along with the Poseidon Trigun Vash Revolver Conversion Kit a couple of years back.
My plan is to offer the Poseidon version of the Vash Revolver in METAL!!!
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The Poseidon version, IMO, is the best and most accurate version of the Vash Revolver out there, and is also different from the Sidkit Vash Revolver. Can't remember what version Sidkit's was, but his was still bada$$. Especially, since he offered it in metal.
There's still a lot of work involved before it is ready for the molds. Such as converting the 44 Magnum parts into recognizable Vash parts, and also tearing up the grip into seperate parts, so part of the grip can be molded and be made into hard black rubber.
Of course, some of you may know I've been working on other projects, and my progress time is usually slow at times. So, when I'll be able to work on this is unknown, but hopefully by next year.