I'm almost willing to be persuaded about plastic body panels... however IMO a "real" replacement Land Rover must;
Be designed for maintenance, not for production
Use comfortably over-specified suspension / steering / braking components
Have a separate chassis
Have an entirely bolt-together body (OK, rivets acceptable too!)
Have as limited use of electronics as possible
Have a very basic and uncluttered cabin
Be designed with easy modification in mind.
Be produced for a decent period (10 years?) with NO remodelling other than to address any serious functional shortcomings discovered in use.
If it were simple enough it would also be cheaper to assemble, even allowing for good components.
The biggest problem I can see in achieving that is on the powertrain side; to meet environmental regulations, modern engines need to use quite a lot of electronics... I'm not really sure how that can be avoided, though using only off-the-shelf components with an existing well proven service record would be best.
If it can't be properly repaired by a basic country garage, it's useless.
Sadly, I expect whatever does end up in production will completely miss the point and will be yet another form over function disaster that is remodelled every 18 months for no good reason