It looks good although I would have gone with a darker metal color on the blade; dirt, surface rust and the color of the bare metal itself wouldn't be a silvery steel color.
I've got the Gasoline dozer blade, but haven't gotten around to building another Sherman to add a blade to, just lazy on my part and I have more kits I haven't built yet to justify building a duplicate to use the blade on.
Good luck on the mine roller. I built the one in 1/35 years ago. One thing I remember is that it took a lot of sanding to get the disks a uniform thickness.