[Kevin Sharpe]

i am considering starting an EV conversion project for the taxi vehicles in my city and would like to know if this is at all doable.

If you add your location to your profile it will help us answer your question

 

[Kevin Sharpe]

Updated

I would recommend visiting Institute Metron in Slovenia (see here). They have converted many vehicles and will be able to give you realistic costs for your fleet based on 'local' knowledge.

That said, it would probably be a lot cheaper to buy older Leaf's and a few rapid chargers

 

[Kevin Sharpe]

So this brings the total price to around 8500 euros. But i am not sure if there are some hidden costs to this price, i will need your help here.

How much are you paying for labour to convert these cars?

as i understood, it would cost around 14 000 to buy a 6-8 years old leafs

If you're buying a few you can easily get good 2014 Leafs for 5000 Euros (a lot less if you're prepared to repair damaged cars).

Here, for example, is a 2012 Leaf with 35343 miles, "normal wear" (minor damage), at auction for 2400 GBP (~2700 Euros);

https://www.copart.co.uk/lot/22479088

 

[Kevin Sharpe]

Currently it should cost me about 500euros to do a conversion with a mechanic.

I suspect you haven't converted many cars to electric drive

The UK car was used as an example after a 60 second web search... Leaf's are widely available at low cost throughout Europe.

Good luck with your project