BigInt, Script and large numbers.

I understand this may be a large ask, but I am not sure. I also don't know the limits of BigInt/Script. Can somebody make me a C3p with Script and BigInt so I can Add, Subtract, Multiply, Divide and Exponent with large numbers. This shouldn't be a big ask, but I need about 4 decimal on division for accuracy. I have a mostly done C3p that does those maths with stings, but feel BigInt, Script will perform better.