Mark, thanks for the detailed post. Mine is scheduled to arrive tomorrow, so it will be nice to have something to compare to. Do you know off the top of your head what the OS 70 weighs? I'll probably go with the same or similar servos as you, so the engine weight will likely be the biggest difference. Are you starting the assembly immediately? I'm trying to clear off my very small work bench now (well, not RIGHT now ), so I won't be doing much to mine in the near future.