London Electric did a conversion on a 1983 RRC they used tesla components.
It only cost £50,000
Main issues were the rear springs had to be replaced for rather stiff units because of the weight and the boot floor had to be raised to accommodate the batteries.
It also couldn't really tow anything, and the other downside is the vehicle weight was close to 3 ton stock so with a trailer even remotely loaded you have to get an LGV/HGV licenece and fit a tacho LOL
To be fair i'm not a cynical however the idea of a full electric LR is an oddity, a reason there isn't one now, even though electric hype has been strong for close to 5 years..
Some underestimate the amount of batteries needed to move such a vehicle, a Tesla "naked" with nothing in it is light "in car terms" however even without an engine a landie is a heavy thing, so range isn't going to be great.
Also space, some have the odd thought that the batteries take up no space and can be just "stuffed in"..
However i doubt you could fit a full Tesla battery pack to a 110 with room to spare, in a 90 i'd say it would be close to impossible.
have you every wondered why the new EV Mini has less range than a Model S?
It is all about space
As for the future being electric, nothing is certain to be fair to 'em they can get good range, however Range is still an issue, you might of noticed the hype around Electric vehicle has gotten stronger but the range hasn't
Towing too is an issue and for vehicles like the Range Rover etc that are heavy things to begin with i doubt they'll go full leccy anytime soon as their main prerogative "among many" is to make it lighter and more efficient
As for Fuel prices rising..
That is a scare mongering tactic by the Gov and populus who preach "green" and bullshít,.
The money this cash cow of a goverment gets from Fuel and tax i doubt they'd give it up
And to be fair how long are they gonna let you scrounge electric for free?
How long will they allow a "no tax" policy?
Nothing comes free..