As per other comments and from owning a Isuzu truck I'd certainly agree it's a better work vehicle option, cheaper, reliable as hell, better carrying & towing capacity and unless you really need the 4x4, get a 4x2.
But your conversion is interesting from the "doing a project" point of view.
So either way, buy the truck so you can reliably keep working to pay for the project Land Rover.
Earning the money is the easy bit.... keeping hold of it is the hard bit.
best regards
DarrenR

