I forgot to say some more datails - the 2s batery pack lays a lot more front - on the servo, which is placed horizontaly above the front axes (for LB chassis needs to be drilled new holes for servo mounts - and also more screw in the ball cups, but you can use the LB standard length steering rods).
Battery is then hold by TL-01 spare plastics (possible to see them in video - holds the pack against side movement), and secured at the front against horizontal movements with transmiter box from DT-03 (screwed to the chassis) and then secured by strip over the servo to the chassis.