Hi Hans61
If you are in the UK be carefull, this would class as a modification to the vehicle and would therefore need to be notified to your insurance company prior to implementation. I have 10 years insurance experience and doubt that an insurance company would cover this change and therefore in the event of a claim and you had not notified them they would make your insurance null and void. Therefore making you liable for any costs not only to your vehicle but any third party claim, including personal injury / death, and then the old bill will also be trying to charge you with an IN10 - Driving without insurance and min 6pts as a bonus!
Not trying to put a damper on your project, sounds interesting!
regards
TomKett