Bit of advice on my drumbot please

[calumco]

Pics

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Last picture showing the weight, need to make a new motor bracket atm so the motor won't be looking wonkey much longer, was going to go for lipos but for the space i had avaliable nimhs were easier to work with. may go for a slightly lighter weapon as the drums 3.7 kg atm aswell wana hopefully aim for a 3kg weapon