I've been considering LiPo for some time, and have been talking to many people and watching the various fabing, taping, pounding and cutting of lead weights for batteries going on and just got discouraged and held off. So...I'm done waiting and have designed a new mounting and balancing system that is going production this week.
This is a 2 piece system that uses high bond adheasive tape to mount to battery (and chassis if ROAR asks). It's made of polished 303 stainless steel, and is precision CNC machined (prototype pic is not polished yet

). It will lock into all 6 chassis slots, and you can use the stock battery strap. The weight goes right where it's best placed, low to chassis and toward outer edge. This will be a near exact match to your NiMh weight (in terms of balance), so if you were balanced with IB / EP4200 you'll be balanced with this conversion on a 9.5 oz Trackpower / Core / Kokam type cell. Battery is now protected, and bullet proof for high speed T-bone jobs is your unfortunate enough to run with me.
Also, I have a phase 2 edition that will weight the other cars...XRay, Schumacher, ect that have low top deck clearance. I expect the prototypes will be completed within 2 weeks, they will have a concealed and adjustable weight system that will look almost as nice

.
Going Lipo just went from a pain to purdy
...enough ramble...here's the goods.