Its been sometime since needing to worry about modification certs for cars, actually I didn't even need them it was before the legislation came to effect when I was doing it, time to get dirty again

Is there usually any issues using these kits in regards to the "low volume certificate" specifically the front cross member/front suspension conversion 20DET from Datsport?
Like most things does it depend on where you take it or the mood that the guys in doing the cert ?
Are the kits considered an OEM part and just require listing on the cert or do they require separate test eg, crack testing weld x-rays etc etc
Any info appreciated from the been there done that camp.
Regards Yoda