How difficult it is to rewrite warcraft 2 from scratch?

[Pandaprewmaster325]

As you probably know a project for rewriting warcraft 3 using java is being developed known as "warsmash"

Now since warcraft 2 is a game with much less stuff in it than warcraft 3 lets say I want to rewrite this game , improve the pathfinding cuz its really awful especially with cliffs and water , can it be done using java? Note that I have no idea how coding works im not a programmer but maybe this can sow the seeds of this idea in someone else head someone talented enough.

What else to add? Better pathfinding comparable to wc3 , maybe add ability to see mana bars and health bars ? Just like warcraft 3 too.