So, setting is an extremely advanced race who use bioengineered tech in many applications, although most commonly in warfare. Their combat troops are large exoskeletal creatures ranging from hand sized spiders to horse sized scorpions. My idea was to have the exoskeleton composed of keratin, spider silk, and bone. It does not have to be in discreet layers as the tech is advanced enough to give the armour a complexed 3D structure. Most opponents are less advanced, in the case in question they stand at around human levels of tech. The armour is also grown into wearable plates as personal armour.
Question is this: how effective would the armour be? What would be its weak points, and strengths. What weapons would be most effective?
Note: I understand that any race this advanced will have better armour. However, the bioengineered 'soldiers' can be grown quickly from the resources on the planet they are invading. This is important as the story is meant to be 'hard sf' so interstellar travel is to difficult to carry a ready-built invasion force.