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Well, if Mongoose wants to stick with his heavy then I'll go with the Galahad but if we all decide we want to embrace being a fast raiding mech lance I'll switch to the Scorpion for sniping, hopefully putting Cammy's marksman and sharpshooter traits to good use.

So, thus far we have

Mongooseh, WHM-6R Warhammer
Kowsauni, GLH-2D Galahad
Raganui Minamoto, TLS-1B Talos
Pupsage, OTT-7J Ostscout

The rules in A Time of War. They lend themselves to RP better.

I mean, if you will let me go mongoose, I 100% will.

Quad 'mechs gain a bonus to piloting ability due to their stability and can in certain situations use their MP more efficiently. As far as chassis go, It's more likely to plop a Gauss Rifle on a Griffin than it is a Scorpion. However, ER PPCs are a thing that could be possible later.

OK.

1) Optimization pass
Traits: Buy off negative traits that don't meet their minimum level OR buy off negative traits:
Cash in positive traits that don't meet their minimum level OR buy up positive traits. Put excess points, or draw points as needed from your XP pool.

Skills: Buy down skills to the highest full level you can use them at. Buy up any skill that has experience than 20 to atleast 20. Put all excess experience into the XP pool.

Attributes: Do the same as above and then draw points from your xp pool to bring each attribute to one full point or until it meets the minimum required by skilll packages or paths.

Notes:
Custom Vehicle does not get you the vehicle, it merely determines what type of vehicle may be made available to you.
Each 'mech has their own set of quirks. Could you please choose a different disadvantage?

Also, a general note. Two points in well equipped and one in wealth should get you most of the equipment you need as a Mechwarrior.

Jun Sato was born under a different name that he doesn't know. At just over three years old his parents were killed in a clan attack. He was put into an orphanage in the Draconis Combine and later adopted by two mercenaries. Intially his adoption served as a ruse. They needed somebody that could find their targets without drawing suspicion. This began the development of Jun's keen vision. His new parents, Hiro and Janet Sato named him Jun, meaning obedient, and he never looked back on his old name or old life.
Eventually he went to college and learned how to operate and repair an industrial mech. As his schooling wrapped up he found a MON-66 Mongoose that was set to be scrapped in a junkyard. He bought it and worked on repairing it over several years until he had finished 3 degrees.
With his mech patched, he set out to the stars, exploring to sky and making money where he could.
He has never been sociable. He looks down on the other empires of the inner sphere. And has PTSD related to the death of his parents and the world of murder that Hiro and Janet raised him in. Still, there arn't many better scouts out there than Jun.

Your right, pg 85