Lessons.

1. There will be no Nova Swords.
2. There will be no fucking Nova Swords.
3. Player Characters starting on the "Bad Guy"s side should not be expected to have any sense of morality whatsoever.
4. If anyone is going to disrupt your carefully laid plans, it will be the Engineer.
5. Do not underestimate your player's problem solving skills. Chances are they are more intelligent than you.
6. A characters broodiness has nothing to do with the time it takes for them to become comic relief.
7. Every character will end up as comic relief.
8. The dice will fuck your players hard, and often.
9. The dice will fuck you hard, and often.
10. Have some sort of knowledge of the economics of your setting.
11. Keep track of CP.
12. Keep track of spaces.
13. Everyone is a sociopath when they need to be.
14. Punishment in a martial setting will be swift and brutal, if only for the safety of those delivering said punishment.
15. Second chances are a really bad idea.
16. Second chances are exceptional plot points.
17. The Mekton Zeta rulebook has the worst layout of any rulebook, every.
18. MZ Core desperately needs errata.
19. MZ Technical Manual has that errata.
20. The MZ Tech Manual will give your players lots of ideas you will not like in the least.
21. "What could possibly go wrong?" Is not a sufficient reason to allow such ideas.
22. Make sure you understand a mechanic before allowing a player to implement it.
23. The Mecha Creation sheet is a guide, not a crutch.
24. Newtypes/psykers/precogs/coordinators/x-rounders/telepaths/empaths are total bullshit.