PHARM,
I really Dig th lil' Panzers !! Lookin forward to it !
As far as interior colors ... Panzerman has pretty much nailed it. From the floor to the top side of the Sponsons would be a Green~Grey ( Tamiya XF-22 is a pretty good dead match). From th top of th sponsons through to the Turret roof it would be the Elfinbein ( Ivory) lighten some Buff & you'd be hittin it .Engine bay - Red Oxide. All of the interior pieces that are mechanical - Vision Block frames, levers, turn handles, the Gun cradles - semi-gloss Black. Transmission - a variation of the Green~Grey ( these components came from different Manufacturers (painted) & were installed in th Assembly Plant. Turning brakes. The interior colors of the Hatches ( minus the engine hatch) would be the Exterior Base coat.
Take care with those sprockets ... They're known to be a lil wonkie !
Lookin' forward to it !