Hello 383, it's been a while since you posted this message but I have only just read it. I am working my way down the route you have struggled through to get your vehicle on the road. Having built my own Defender from parts that have no link to any registration number or Vin number and with a new chassis, I have been allocated a Vin by the DVLA and will have to put the Landy in for the IVA test early next year , all being well. My main concern is, in the DVLA testers manual for the IVA test it keeps stating that the applicant has to provide ' satisfactory evidence of compliance' for example for Noise levels, Emissions, Alarm and Immobilisation systems. How did you get on with these issues ?