I see those from time to time around here!. They are made of fibreglass, so also weigh very little.
They are also rear wheel drive, which means there will be an axle where a regen / electric motor could
be added if converting to a hybrid!
With a suitable boat-tail, they would make an extremely good FE car (or electric car).
The last models, in 2001, came with CD player and electric windows as standard
http://en.wikipedia.org/wiki/Reliant_Robin
http://www.3wheelers.com/robin.html
This is what I would buy (boat tail would be much easier)
http://cgi.ebay.co.uk/Reliant-Robin-...QQcmdZViewItem
P.S. The Reliant Scimitar (a sports coupe, 4-wheel drive) came in a turbo version - this had the exact same engine that is in my Bluebird (as in my avatar!)