2nd hand is probably the cheapest option but then you will probably never get exactly what your looking for.
In my opinion current ADR's make it difficult to build a Cobra under 45 to 50 K unless you use all 2nd hand parts without reconditioning anything.
Costs do vary depending on how much you are able to do yourself.
Would be surprised if you could get a turn key under 65 to 70 K
My car will owe me 50K+ once painted. To purchase it as a turn key would have been about 80 to 90K (I reckon). But then I did some extra things like air conditioning.
