Here's a tip when you front court
They'll ask you to state you name, professional occupation and experience, etc.
Then they will dismiss you if you are irrelevant.
Um not unless you're up to give evidence of technical nature. No one gets called up to give that sort of evidence unless they are qualified to do so, which is screened for well before you're even asked to give such evidence.
So no, that's not how that happens.
Also not really relevant in relation to an argument around contractual terms relating to costs, which are spelled out in the contract. The only things considered in such an argument would be whether the costs in contract were applied inline with the contractual terms. No Technical expert, especially an engineer, would be required for such a case to be heard and decided. At best an accountant might be called to show the workings if the lawyer didn't understand how to use a calculator.
This is like listening to a monkey randomly hit buttons on and speak and spell.