The only problem I see Joe is that it looks too clean! Once it's dirty and scarred up like your dozer, they'll definitely look like a matched set.
An excavator or wheel loader or mid sized haul trk would be a nice addition to your fleet. The scale you're building in, a finnish grader is possible.
Also, start dreaming of a dirt work project to put them to work... how big is your backyard? Dig a swimming pool maybe... then fill it back in again.
