It comes to my attention that the layers in .j2l files are actually named:

• L0 Auto
• L1 Auto
• L2 Auto
• L3 Auto
• L4 Auto
• L5 Auto
• L6 Auto
• L7 Auto

My guesstimation indicates that the game renders, in this order:

1. ID: 1118 ...1. Chat
2. ID: 32774 ...2. Player sprite(s)
3. ID: 32780 ...3. Layer 2
4. ID: 32781 ...4. Layer 3
5. ID: 32782 ...5. Layer 4
6. ID: 32783 ...6. Layer 5
7. ID: 32784 ...7. Layer 6
8. ID: 32785 ...8. Layer 7
9. ID: 32786 ...9. Layer 8
10. ID: 32787 ...10. Layer 1
11. ID: 32808 ...11. Layer 1 motion
12. ID: 32809 ...12. Layer 2 motion
13. ID: 32810 ...13. Layer 3 motion
14. ID: 32811 ...14. Layer 4 motion
15. ID: 32812 ...15. Layer 5 motion
16. ID: 32813 ...16. Layer 6 motion
17. ID: 32814 ...17. Layer 7 motion
18. ID: 32815 ...18. Layer 8 motion
19. ID: 32819 ...19. Green
20. ID: 32854 ...20. Red
21. ID: 32958 ...21. Blue
22. ID: 57600 ...22. Yellow
23. ID: 57601 ...23. Pink
24. ID: 57603 ...24. Grey
25. ID: 57643 ...25. Teal
26. ID: 57670 ...26. Statistical overlay or player naming system
27. ID: 57680 ...27. Statistical overlay or player naming system
28. ID: 57681 ...28. Jackrabbit running on or off