I put the Vulcan together today and it doesn't look too bad. I think the medium laser (left torso) could have been a bit beefier, some missing fine detail on the head and there's some fixing up to do on the left elbow. The rest seems to be OK.
I've been thinking about scale again. Here's a lineup with a 20 ton FLEA, 20 ton Locust, 40 ton Vulcan and 55 ton Griffin. I think I'm going to try and reprint the FLEA a little smaller (maybe 5%) and the VULCAN could be about as tall as the Griffin (align the tops of their heads).