That's some yummy nostalgia.
If I shorten the original idea by a ton I could make a new Turnstile mod. With the new Spirit 1.7 or whatever the latest version is, I could do quite a bit.
Either way, I will finish the weapons as they would appear in the mod which would be a scientist style arm and not an HEV suit arm. One thing at a time though. I need to finish my L4D2 map, and this is the secondary project. I usually work on two things at a time any way.
Stay tuned.