Lightweight E-maxx tips needed

I want to build a lightweight E-Maxx 3905. So far I've got:

- neu 1515 3d & mgm 8s140a & dim.eng. bec;
- rpm true track, rpm front arms & axle carriers;
- fullforce rc carbon turnbuckles;
- lunsford titanium hinge pins;
- one servo;
- 4 shocks;
- single motor mount;

I still need:
- Wheels: proline 0 offset vtr&caliber?
- Lipos: what amp draw can I expect on 6s, geared for 35-40mph?
- Titanium pivot balls: Lunsford ones are too expensive. Any other good ones?
- Shafts: are steel cvd's lighter than stock plastic shafts?
- More ideas to get rid of some weight?

I'm not getting the g4, flm or xtremerc chassis.
I know serum's 3906 e-maxx was 6.8lbs fully loaded, so that's my target..