I know it’s not exact but this is what a got after messing around in ldd on and off for a week and trying to keep it around minifig scale.
Thoughts?
It’s a good attempt and a nice design, but unless I knew what it was supposed to be, I wouldn’t guess it was a rocket launcher. I would maybe try and design it to sit on the shoulder or add some other colors like bright gray to make it more distinguishable. Keep at it though! Can’t wait to see the next iteration
> 2535435034737281;2:
> It’s a good attempt and a nice design, but unless I knew what it was supposed to be, I wouldn’t guess it was a rocket launcher. I would maybe try and design it to sit on the shoulder or add some other colors like bright gray to make it more distinguishable. Keep at it though! Can’t wait to see the next iteration
Can’t really have the fig hold it right if rested on the shoulder due to no elbows and while hashing it out I choose to keep it one color. Hopefully I can think up another iteration. 
> 2535458925691235;3:
> > 2535435034737281;2:
> > It’s a good attempt and a nice design, but unless I knew what it was supposed to be, I wouldn’t guess it was a rocket launcher. I would maybe try and design it to sit on the shoulder or add some other colors like bright gray to make it more distinguishable. Keep at it though! Can’t wait to see the next iteration
>
> Can’t really have the fig hold it right if rested on the shoulder due to no elbows and while hashing it out I choose to keep it one color. Hopefully I can think up another iteration.
Fair enough. Have you tried adding some 1/2 bushes to the tubes to thicken them a bit? Might beef it up a bit but those tubes are iconic
the light gray id is 4211573, not sure what the black equivalent is