As you can see there are now four different variations. There's the base model, the "C" variant, the "A" variant, and the "S" variant. Each one has minor variations in the build that sets them apart beyond the attachments.
The "C" -- for Close Combat -- Variant is 2Rh+d8 (flamethrowers) /1B (armored body) /1G+d8 (wheeled feet + rocket boosters) /2W. Flickr page.
The "A" -- for Artillery -- Variant is 2Ra+d8 (twin cannons) /1B (armored body) /1G (wheeld feet) /2W. Flickr page.
The "S" -- for Scout -- Variant is 1B (armored body) /1G+d8 (wheeled feet + rocket boosters) /2Y (expanded comms + scanners) /2W. Flickr page.
The only thing I really need for these are more 1x2 plates in different colors to tell the difference between the unmodified versions, and Single Shot Rockets. Although I have an idea of what I'm going to use for SSRs.