Electric cars are usually crippled by either heavy batteries or expensive batteries. And don't forget that getting an electric motor that is lightweight and capable of 70kW won't be that cheap.
If you could solve these problems it's a great idea. 70kW would give very spritely performance in a roadster thanks to most electric motors having peak torque from 0 rpm to peak revs (normally about 5k but some can go a lot more). Also electric motors are rated by their nominal power not their peak like IC engines. Thats like rating your car engine by its power at its torque peak, so realisitically peak power can be twice that. 70kW = 100bhp.
For a good idea of what can be done if the battery and motor sourcing problem is overcome have a look at the Tesla Roadster. It can thrash ferraris, corvettes etc with only 180kW. Top speed peaks at 130mph but thats far too dangerous on public roads anyway. Incidentally they used a AC induction motor rather than DC and a lot of Lithium ion batteries both of which are not cheap - £10K+ just for the battery pack.
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