Tell us mor about what units your going to be doing other than Yarrick and Sly.
I like the Yarrick model. Its very neat, but there are a couple of things I would recommend. On the power claws cable, there is a hugh lump of flash which could do with being cut off. Did you put a wash on any of the metalics? SOmetimes its hard to tell in pictures as the effect is lost under the flash. If not I would recomend a black wash on the silver and a brown wash on the gold. It will give them a more used realistic look.
Great work and look forward to seeing more in this log.
Your toast has been burnt and no amount of scraping will get rid of the black bits.