I cut the sub frame down to the main supporting bars. Then took the battery box, cut all the remaining bars off it and took it and the sub frame to my local welding shop and told them where I wanted it mounted.
As far as lightening the frame, get a good 4" grinder and saazall, LOL. Cut off everything that doesnt need to be there. Brackets, gussets, supports. You can eliminate a ton of weight with a good chromoly swingarm, and a aluminum Drag Axle. I reccomend JJ&A.
Swing Arm - Damion Cole with Black Label Raing
JJ&A Axle - Jeff Ross
The A1 A2 cams are decent cams, but I wouldnt call them great. If you want to go all out with a drag bike, you can do alot better for cams. The two biggest DS guru's out there are Eric Oldham (Mr Horsepower), and Jeff Ross (THEBOM). I personally go through OMW racing which is Mr Horsepower, but THEBOM Racing will take care of you as well.