Your build looks fine, though, I wouldn't focus on wisdom, if I were planning on playing Guardian.
As said, the differences between a scout and a soldier are negligible. The soldier gets a few more points in vitality, but the scout gets better saves. Scouts and soldiers pretty much get the same number of features, if you count implants. Scouts just get a lot more skill points, which can go into persuade, awareness, and first aid, or repair if your into repairing. Repairing and hacking is a good way to get a few extra exp points. The soldier does get maybe 2 more points in chance to hit, but that is pretty negligible.
I wouldn't play the game as 4/16. You don't really need that many force powers. You're only going to need to use about 5-6 force powers. Not leveling up at the beginning can also create a glich that prevents your other characters from recieving exp, until you do level up. Not to mention, you will recieve more feature points if you do level up your starting class more. I would prefer the more feature points, since I don't think you need that many force powers. A 7/13 character would be more balanced, imo.
Everyone has their own playing style, though.
shift244 wrote:As a note: Practical and proper tactical application of items would allow even a level 2 Scoundrel solo most of the game on Normal, so I don't think it's there's much to worry about having a build that would make the later stages difficult.
Solo most of the game with a level 2 scoundrel? It might be possible, but you would have to hope that no grenades get thrown at you and that no enemy jedi use force stun on you. At level 2, you wouldn't even have really that many saving throws to protect you from force stun.