I just made this remix of the great @ankhx design. I just removed part of the floor to save some material and time during printing. Of course, you need to print the left part of the original design.
v2 - Reduced hole size to work also with non sleeved hero sheets.
v3 - Added the right part of the insert (slots for items / boons / title, top preparedcards) with holes holes in the floor where cards are stored.