Thanks for the feedback Merf,
I admit the nose on the Osiris did come out a bit longer and more hooky than I wanted it to (looks similar to a raven, yes...)
As for the Holly, the arms aren't actually arms, rather just swivelling weapon pods (pitch only) fixed to the torso. Since my Holly needs to crouch to shoot accurately with it's main gun, having it's lasers mounted low down might render them un-usable if behind a small hill for example. Having everything in-line with the cockpit (and main gun) allows them to all be used from a 'hull down' position.
Just my thinking behind it all anyway... I do agree maybe a bit of horizontal spacing between the gun and the cockpit is needed, it is fitting a bit close together. I also think the negative space of the main gun mount requires some re-work. I might revisit it at some point.