Has it been recently raced at a track that you’re planning running at? Many early 2k chassis run older style bodywork that some tracks may not allow.
Carbon fiber parts can be an issue as well, legality can vary.
Have them verify the model of the chassis and ybe homolgation. CRG spindles and axle on a topkart seems like an odd mix, but it might have worked well for them.
Some tips on chassis Identification here: