Although it is hard to tell from this image as it does not enlarge well, The helmet looks off, almost too symmetrical and long in the face. FX helmets were grandfathered due to their inaccuracy vs what is now available. Because there are so many good manufacturers around these days, you would totally stand out in a line up so I think the helmet is the first component that would hold you up from getting 501st approval.
As to the rest of the parts, until something is printed out and can be seen in 3 dimensions rather than a poor render image that pixelates when enlarged, no further true assessment can be made.
With this type of costume, certain parts of the armour need a degree of flex, the shin enclosures are the perfect example of that and I highly doubt reinforced ABS or PLA will take the punishment that 1.5 to 2mm pulled ABS can in the flex department.
Remember if you intend to troop in it, you need something that is reasonably comfortable, allows the degree of motion required to actually move around and walk, plus you don't want it too heavy or difficult to pack and transport and it must be durable enough to deal with the rigors of trooping, so you see there are many factors that need to be considered.