Yes.
Machnator LMG/HMG's.... I find them to be a waste and you will find yourself not placing the pedal to the metal as you should with those units because you will subconsciously look for reasons to have the LMG/HMG shoot.
Mirrormen: split into two units. You will get more punishment delivered out of two units of 4 than one of 8. Trust me... or Ask jjdodger. Torso enhancement is overkill... I think the points should go elsewhere if there a place for it... if you expect B-F-UGLIES, then it makes sense.
Reavers... good size. The Steelskin is worth it. the Torso Enhancement is not for the same reason as above.
19th Silent.... Bait/diversionary unit. I approve. I think Shocktroopers are a better call for that but if you are planning on landing them on a flank, makes better sense. If they are in the middle going "Come Get Me!!" then Shockers would be better for their smoke grenades.
I disagree with John's assessment of LMG Machinators. Firstly, a high-armor, two-wound MG platform at low-cost is an excellent addition to any force. Three of them is enough fire at short-range to be a force all their own (see the Reavers). Secondly, they give pause to anyone who would step out into the open to start trying to mow down the machinators.
As for splitting the Mirrormen, with John, I agree, here. Two squads are more manueverable, and give you an extra activation, to boot. Any additioanl activations are good activations.
I am not big on spending points for enhancement, unless they are going to get used - a lot! CC troops with steelskin and torso-enh. are good, assumming you get to use it before they're dead. This is a completely personal thing - I would ensure that I am going to be using the points, whether spent on enhancements, or on another model or three. Therefore, I would skip the torso-enh. on the Reavers, as I would be using them to lay down fire - not getting into CC. Call it incentive to remain at firing range.