Everything looks acceptable, although I'll have a few points to bring up on the history.
Basically, learning to fly a frame in a week/teaching someone else to fight in a special style in a week is a bit hard to swallow. A Frame Runner would be given three-month training courses and be expected to take in hundreds of hours of simulated flight time, be given sim examinations and then earn a permit to train using the actual units, in the field.
Using a more realistic time frame would also benefit the relationship with the friend, Pahun, and make it have a bit more of an impact on him.
Don't be afraid to cut loose with backstory!