Making a Tekken clone

/g/, I want to create a video game, specifically, a Tekken clone. I'm a very competitive Tekken player but I'm really turned off by the direction my char's taking (Hwoarang); he just became cheaper as the series went on.

I plan the game to feature more accurate TaeKwonDo. It won't feature many other styles; maybe I'll port Jin (Karate) but that's about it. But the fighting system will be lifted exactly from Tekken. Graphics will be simple but 3D (like Tekken 3 or even simpler).

How hard is this exactly?

so there are moves and ways to block moves
hits depend on timing?

so that would look like two guys pressing buttons in an effort to attack the other before it can be blocked
a nice simplification

>The system is heavily frame-based. The game is 60 fps. Each move has a certain number of frames to execute and impose frame penalties and advantages on the opponent on hitting.

u wot m8?