Nothing’s impossible but the 2wd to 4wd conversion has never been done. What has been done twice now is fit the Florida roof to a 4×4 van. To do this you have to fabricate an extension to the fibre glass roof. Then you could fit the Florida interior with some modification. Did you take a look at this blog post: http://vwlt.co.uk/2016/06/16/andras-felegyhazy-and-his-4×4-extra-high-top-conversion/ Sign up to VOLT on Facebook where there are more pics and a willing audience for questions like this!

This guy quoted me between £15k & £20k to convert a 2WD LT to a 4×4 as he did with the T25 you can see on his website: http://belfield4x4.vpweb.co.uk