I can also confirm the kustomized medal is broken, and upgrading everything doesn't work.
That was a good 4-to-5 hours of good gaming. I had no problems beating it at all with upgrading the guns and missiles first, then the exhaust for the races, then everything else.
Farming with one hand while you multitask is also very easy to do on every boss except for the last one.
Also, after staying up all night last night playing monstertime, i can honestly say I haven't gotten that pissed at a game since Mortal Kombat Deadly Alliance on brutal.
That 200k medal will def. be one to flaunt if you got it. The closest I came was 160k.
I don't think a video guide will really work for monstertime, because the monsters don't always go in the same direction, insert chaos theory and you've got a few problems. I could be wrong, i dunno, I'd just hate for someone to waste that much time, and probably go through the same rage for almost nothing.
I wish I could get my missing medal list smaller. I recommend you make one if your in the top and you got enough spare time, because it makes achieving the ones you dont have yet that much better. lol.
Time to pack a bowl and call it a night.
Happy gaming/medal hunting.