Add tube doors to your CJ-7. Three different types to choose from - tube only, tube & grill or tube filled with grill.
You'll need to add supports for the hinges (see slicer image). Otherwise print in PLA or PETG for a bit more strength.
Lastly, you'll need two M2x8mm (6 or 10 also work) to secure the door pegs. The stock holding pins will work without issue.