no support needed
PLA is working fine for all pieces
you can keep the dual color theme of the puzzle with this box by keeping the 2 colors you use for the lighthouse - one color for the base and the top and one color for the ribbon / toppers / plate and insert. Dual colors for the optional guard if customized.
for the insert, it is enough (and recommended) to use a 5% infill with a lightning fill
everything else with an infill of 15 or 20% is good
if you want to customize the optional guard you could add a logo and/or text in Sketchup, Fusion, etc. Please keep 1 mm in height for everything you add to the guard (space in the box is tight).

please refer to 3D Printy Twist Lock Present for assembly of the box
https://www.printables.com/model/89174-twist-lock-present
The insert fits in the box with .5mm space so it could be removed easily to use this nice box for other purposed than storage of the lighthouse.

if you want other toppers that this one, you can go to my remix toppers
https://www.printables.com/model/221063-toppers-for-3d-printy-boxes-gift-box-other-twist-l
To use them with this specific box you want to increase them by 7% (in Prusaslicer / scale put 107 - see image below).

My other Gift boxes for 3D Printy Puzzles:

UPDATE

22/09/22 - I added a nice duck topper which fits the 2-color scheme of the lighthouse

Yes! This project was shared under the Creative Commons - Attribution license.

This license allows selling copies, but you must provide proper attribution, as detailed in the license itself.

Please note that any other projects linked here (remixes or related projects) may have a different license. Please respect those licenses.

Model origin

The author remixed this model.

Gift Box for 3D Printy Lunar Lighthouse Puzzle Box