Nothing is wrong with the coils. The idea is really good.
Anyway I think parts of the chassis should built by professionals. A "private welding line" is not the same "welding line" of a original equipment manufacturer.
I respect your work very much, but tires, brakes and chassis are the most important parts of a car and we don't image what strenghts have influence on this parts.
Yes, yes, yes and one more million of "yes"!
But! This car is not for track days, it even won't drive faster 90 km/h! Diesel engine, old sick diesel inside. 
And if Ihad a possibility to make my suspension similar to yours, I would do it. Unfortunately, I live in Ukraine, here we have nearly "lithic age" in such cases, so I just forced to do everything by myself.
While Kadett is being repaired, I would like to share some picture from the last year all Ukrainian stance gathering, that took place in Uman' in may 2011. We made over 600 kilometers to get there, but it was a great trip! It was a first this kind of meeting, and we were very glad to visit it. Many great, stylish and very looooow cars, a lot of inspiration, a lot of new friends! Now just photos - enjoy.
P.S. You can see me on the last picture, outside right. 
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Nun BTT