I don't really know, I mean, i prefer building alone so if you're thinking about building in team i have to consider about it. The other reason is that i don't spend all my time playing minecraft. I have other games to play, other things to do, and in minecraft, other things to build; not only military vehicles so it's hard to decide. I can join this group but If it's possible i would prefer building alone and posting my projects the same way as I do it now. Anyway, thanks for the invitation.

It could be modified but dispenser was placed to imitate the rocket launcher:

http://www.naval-technology.com/projects/navy-future-lynx/navy-future-lynx5.html

Check this here ^^