You missed out the most important question,

And HOW MUCH will it cost, answer= thousands of £'s

Look in the General Discussion section , there are several threads about 4 x 4
The most common way seems to be to use a 20 year old floor pan and suspension and transmission from a Sapphire 4x4.

http://www.andrewgallacher.com/

https://passionford.com/forum/viewtopic.php?t=140414

https://passionford.com/forum/viewtopic.php?t=303194

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