My "blueprint" for my new mohawk

I know it sounds a little lame but I've been planning out how i want it cut and everything. I want to know if its a nice idea with all the measurements :P 

I'm planning on getting a crosshawk, it will keep my face frame in site but get rid of all that long hair in the back :P I'm waiting a little because my hair is a little layered and i want the top layer to grow out a little bit for a taller 'hawk. :) 

:D I won't shave my head~ I'm thinking of buzzing it down to an inch/ 2 cm. A little coverage and maybe later i might dye it. The height, if it will grow that long, may be 3 inches. 

This will be my first time doing this. :D