Michele;
Hi! That sure is an awesome kit, IMO!

And I think you be right to say it does not need much if anything to hit a good (even great) level!
It's glory and goodness lie in part in it's relative completeness, both inside and out. Because it is open on top, and this inside stuff is seen, you want to address it carefully. I suggest that you do your build in sub-assemblies or units. Some subs and steps might be - assemble and paint suspension minus wheels (allowing you to get paint and some base weathering in behind the wheels - which I would do separately and later mount once stuff is painted behind them), assemble and paint wheels, assemble and paint inside of hull / crew compartment (maybe leaving out some things to get better access to floors and sides, etc.), assemble and paint gun barrel and mount, assemble and paint inside of upper hull. Once these subs are painted, assemble the entire hull and gun minus wheels, and paint the exterior (mask the open inside). After all the exterior is done, mount on gas-cans and maybe tools and stuff, and those pre-painted wheels. Detail the tools, do some chipping and decals and then weather it, and you be done!
That would be my suggested approach! Enjoy the kit and the build!
Bob