You will need a "infinite health" cheat for this. Go past Ichon to the NK fortress base,activate the cheat now or u will DIE!!! alright go into the restricted zone. There are a lot of blueprints here so look around. Now run to the left side of the area, u should find an area where u can go up the hill. Go up and follow the trail past the first two cannon things.
There will be another area where u can go up higher. go straight and u will see....
(drum roll please)
The "type 07 prototype"
*angelic choir sound