While not as powerful as a top tier class, when you mix abilities between archetypes, there's a potential to be overpowered compared to other non-caster members of the party. If you look at any of the archetypes, one or a couple of the class features may be rather powerful compared to other abilities in the same archetype, this allows granting possible overly powerful abilities which are balanced with slightly underpowered abilities - this is true with every archetype. So if you only choose the most powerful class features in several archetypes, you could easily build one that is very over powered compared to other archetypes.
I don't allow my players to mix and match different archetypes into one they want to play. Since I do design archetypes for my various Kaidan books, if a player has a concept they want to play as an archetype, I look at what features they want, then try to build a custom archetype that includes what they want balanced with underpowered abilities so the final result is somewhat comparable to other archetypes in power.
Granted that any noncaster archetype is probably weaker than any Tier 1 class, so one may allow any powerful non-caster build. Again the problem is when you have blinders on and the only comparison is between the powerful archetype and a tier 1 class. Compare instead between a powerful archetyped martial build with another perhaps nonpowerful archetype martial build. Is there balance between the two? If not, your build as you want isn't very feasible way of building an archetype.