I'll step outside of my usual BATTLETECH only box and recommend some minis for the DYSTOPIAN WARS series.
They're less expensive and with their high detail, extremely easy to paint and make them look great.
for instance: Cromwell Bombards. Resin minis with awesome detail. Dont even HAVE to primer them. (I did tho)
1. Krylon light grey primer
2. Dark Army Green base coat.
3. Lamp black covering to treads and exposed engine parts.
4. Gunmetal heavy coat on the main gun and workings., light brush on the treads, drive train and engines.
5. Medium Army Green dry brush of remaining green parts.
6. Medium Brown dry brush/smearing of lower hull and tracks.
7. Silver dry brush/highlight of main gun muzzle, machine guns: very sparingly.
8. final wash: either chaos black or sewer brown> coat evenly, try to avoid excess puddling.
LET DRY. preferably 24 hours.
9. Clear Coat. FLAT/Dull coat.
my results look alot like this, but without the brass or excessive shinyness.