Yeah, kinda made this account just to reply but I just felt bad for the people who might be listening to Hanzo about builds. I'm not really trying to attack you nor try to offend you, well kinda, but give you some insight on your understanding of the game mechanics and what's useful or not.
Rage Machine Gun -
First off there is no way you can equip 4 rage machine guns. One RMG is 160 cost and four of them would equal to 640 cost. There is not one bot in this game that has 640 free cost even with all capacity upgrades. Let alone have enough cost to let you equip 4 arms, 2 asura, legs, booster, and a head. As for RMG's effectiveness in battle that differs on the player. But most people won't want to use one because
1) the cost
2) -3 fly
3) bullet damage is not justifiable for the cost and stat loss even with the high rate of fire
4) it really has horrible tracking and just sprays everywhere
Moving Burst Cartridge -
Moving burst does let you fire all your weapon while you're moving BUT it only lasts for 1-2 seconds. Moving burst is horrible for machines guns and are really only useful for burst fire weapons. By burst fire I mean single shot or burst weapons i.e. Bazookas, Magnums, and/or Auto beam rifles. They're next to useless on arts and are mostly only useful for LND or AIR. Lily Rain really is the only ART that benefits from it.
Asuras -
Asuras are very impractical, costly, and really have no use besides trying to fit as many weapons as you can for the lulz. Just because you can have 4 arms doesn't really mean you should.
This build you're thinking of is nothing more than a power spot standing turret cannon fodder for AIR types to run circles on. Well not just AIRs actually, any type of bot that has mobility will probably run circles over you.
Practicality and mobility > 283671826 weapons in this game.
Toybox Cruise Missiles -
By far are one of the worst missiles ever in this game. Let me list the reasons why...
1) Damage is abysmally low.
2) Horrible tracking, or actually the lack of it. It practically just goes straight. It can and will be dodge by anyone who is slightly moving to the left/right. Think of the Millennium Falcon scene on Star Wars. They hardly really ever hit unless you're shooting the power spot.
3) Fire rate is just god damn slow
4) The way it fires. The way it fires is that the missiles get shot out in front of you at ground level then fire off their boosters. This is horrible when it comes to maps with uneven terrain as the missile will just hit that and explode there. You have to find high ground to launch those things.
Yeah it does have a pretty big blast radius but that blast radius really only damage on the 4s range. It doesn't justify the weapon to be actually effective.
All-in-all anything is pretty much better than Toybox cruise missiles. Go with Sturbanger or Destructor as sturbanger has the lowest wlk stats out of all the ARTs.
And I guess I'll just leave it at that...