Congrats on getting this one done! As a note for future builds, the interior on open-top vehicles generally matched the exterior in terms of paint color. The reason for the off-white color for turreted or close-topped vehicles was to enhance visibility of the crew inside the vehicle...and with an open top that's not necessary. Plus the white had the added negative effect of making the vehicle very visible from the air and thus turning it into an inviting target!
It's good to see you adding figures and basework to your build, keep it up!