Freelanders are fine off-road as long as you know their limitations. I never found them on my Freelander, but I had a well sorted, lifted, waterproofed and remapped TD4 auto. Have a read of my thread about my Freelander.
Get rid of the infernal combustion engine and drive train etc , get a large battery and 2 electric motors of around 100bhp each. Lift kit & bigger wheels.
Definitely a pipe dream. That would cost £15-20k.
I have a set of 5 spoke 16" wheels and Vredestein winter tyres for sale. See the link in the for sale page.
215/70R16 set of 5 tyres almost new.
http://www.landyzone.co.uk/lz/f62/freelander-1-wheels-almost-new-tyres-284333.html
I have some Land Rover 16" Alloys shod with almost brand new Vredestein Wintrac 4 Xtreme 215/70 R16 tyres.
I'm putting them on eBay and listing them in the for sale section if anybody is interested.