Thanks all for your feed-back, that's just what I mean, If someone else looks at your work they'll spot the things you overlook yourself. I'll follow the advice and and a little detail to the MG area but not to much as it's really all about the finish of the tank. There is no great secret to the ice and gunk. I mix a brew of PVA glue (or elmers glue as I believe you call it in the USA), sand or railway scattermaterial, paint if required and dilute with water to get the right consistency to apply. This goes really for ice or mud. For runny mud I add more water, for sticky mud a little less. It wont really show when dry, but the difference is in the applying. Try to mimic reality, Ice usualy sticks to (cold) steel in great big clumps. I apply the mixture with an old brush with very short bristels, layer by layer. As for the grass, how could I miss that

The base didn't start out as a winter dio, that's why. I'll make sure it will look very dead when finished!
Ooh and when taking photo's of snow scenes, try to take picture with quite stark light, as that really brings out the cold temprature of the white.
Once again thanks for your input.
Cheers
Henk