Based off of Vergere's question in Your most cringeworthy builds thread, I built (and have been running) my little Gun Bunny. No jump jets, not much ammo, but fun to speed up to an assault mech and blast a shotgun round into its face. Eventually I'll need to buy an XL210 engine and put some jump jets and another ton of ammo to improve it, but this is what I'm running now. This would be the improved version:
Got this one.... less than 45 rounds of ammo are not nearly enough.... I dropped the JJs (never needed them) and added extra slugs....
Admittedly, it is always disappointing when the gun runs empty, but I do a lot of jump turns as a countermeasure for other lights, so my jump jets stay in.