Here I will set out the rough cost of an EV conversion with mainly new parts (Not from China) if you are using your manual gearbox. Not including labour
*Depending on the car
Controller & Motor ..... NetGain HyPer9 AC Motor (120HP 220NM Torque) X1 Controller Kit £4220
Gearbox Adaptor .... Depending on application £850 upwards
Motor mount ..... Circa £100
Cooling for controller ..... £350
Throttle ...... £200
DC to DC converter ...... £320
Battery disconnect ..... £100
Battery box ....... Depending on your own skills circa £400
Charger 6.6KW....... £1350
Charge Port Type 2 ....... £300
Fuses ...... £150
Wire ....... £100
Misc ...... £1500
Brake vacuum Pump £250
*Electric Power steering pump £50 (Used Vauxhall)
*Heater 3KW ...... £150
Total not including batteries £10390
For a decent power and range you need to budget at least £4000 for new Lithium Ion batteries
You can go much cheaper with Lead batteries; however they are heavy, big, with less power and range.
You can go the used route with Nissan Leaf battery Packs (24KW , 30KW, 40KW)
Alternatively Tesla used batteries. Hard to find and need cooling.
Other battery options are available.
So realistically if you want over 100 miles range with a half decent power its £15,000 and you need to factor in the cost of a donor vehicle unless you already have one.
Of course you can sell the ICE parts not needed on the car so there is some money to reduce the cost.
I hope this helps, and if anyone finds some good deals out there on the list above please let us all know.