Circuit for reversing a DC Motor with two 5 pin relays
the circuit looks good,
The RC snubber shpould be connected at the points where the current is switched (at the isolation switch, and on the relays contacts both normally open and normally closed)
on the motor a suppression capacitor can be used to reduce EMI.
When the limit switch is activated and the relay switches back off the motor will be short-circuited so it will slow rapidly.