Got some more work done. Drilled and tapped 4 holes to mount the plate to the chassis, thru existing holes. Also mounted the brake servo mount to the plate, used coutersunk screws so the plate sits flush on the chassis.
Waiting on gears so I can mock up the motor clamps and drill holes for them. Will make a battery tray and trim the brake servo plate as my bandsaw tires just arrived (yay). Need to wire up the MMM and make a mount for the receiver, pretty sure I will put it next to the steering servo. Then I get to attemot to remember how to program the M11 to slave the brake servo on ch4... Sounds like alot of fun.
Here are a few pics with the tires and body on.