The filter on the carb was the one that was being sold on the store here. I believe Lancer was the contact for them? I don't see them anymore, I believe they were trying to track down why the filters were tearing. No problems so far with mine, but I've probably put less than 100~ miles on the bike since mounting it.

The crank case filter was just a cheapy filter that I picked up at Advance Auto (and I'm sure Pep Boys, A&A, AutoZone) would have them too. It was in the ricer section (neon lights, tire flys, etc) and ran $10. I got the blue one because it matched the bike... But I've seen red and black ones too.

The box was a big PITA to remove... You'll have to pull the battery, remove the battery box. There are 3 total bolts holding the box in place and then you'll have to fanagle it out of the frame. I'm not sure how the CM carb mods change the carb itself... But, I removed my box with the carb still on the engine. If you remove the carb, it'd be a breeze to get out because you could twist it as you needed to pull out.

There was a thread about this a few weeks ago that documented where the 3rd (and hardest to reach) bolt is located. It's up under the belt guard. I did mine with a small ratchet and it came right off.

As for DJ's battery setup... I'll let him chime in too. But he's posted before that his right bag is essentially a hard bag, encased in a soft bag. He's got a thick piece of plastic against the back of the bag the holds the battery in place. The bag itself is zip tied to the bag supports that he used (which aren't Savage/S40 pieces). Maybe he can chime in again with one of his detailed drawings of how it looks.

It's the same setup that I am going to try running... I'm getting a set of Savage saddlebag supports, because they come back furhter and will give the bag more support and room to zip to on... Where the S40 brackets are all towards the front of the bag.