Plate nibblers useful/indispensable and, if so, what should be taken into account?

Hi, since I am now dedicated to the sheet metal processing of my Alteisen project, the question arises to me, what I can still make the work easier for me. Angle grinders of sizes 120,110 and a 75 mini battery (and still a 240, but I don’t want to cut the car small) Otherwise jigsaw and a simple sheet metal shear. However, the sheet metal shears always require a subsequent smooth knock, so is rather unpopular. Where would such a sheet metal nibbler help me? If meaningful, what do you have to do? There are also essays for the drilling machine, what do they do (I want to fix the car only once in the near future) or is the total scrap, or what disadvantages/advantages do they have compared to a complete device? Looking forward to your answer(s)! Greetings Chris