I really enjoyed building my RC Sandcrawler. It still a thing of beauty to me some years on.
Building an interior is a decision I wouldn't enter lightly into. You'll probably be able to run the lighting around the interior sides without too much trouble but you'll need to plan it out more carefully.
I access mine through the top to put in batteries but I still have to be carefull. Resin is very "chippable" and the less you mess with the model once its built the better its chances of survival.
I didn't do an interior because I didn't want all the effort of something that rarely scene and not many people have much of an interest in anyway. The LED lighting was enough of a bonus to suggest it, with stairwells , access ports and the cabin. It actually adds to the scale of the model in a darkened room, like the film studio scale .
You may want to consider "pinning" those large side panels and base, otherwise it could be a problem going on in the future and it helps hold everything together. Here is my thread link to show you how to do it :
https://www.therpf.com/showthread.php?t=71711 . Nearly ten years on I've had zero problems with the model, but getting those joints to hold without popping open everytime I took off the clamps when I built it was pretty frustrating. The pin and stick solved that immediately.
Great start and work on the model so far, good luck with the rest of it.