hi
to be able to ping the ip address of the ASA's cust1 interface over the tunnel, configure:
management-access cust1
As for connectivity to the LAN, I think you have your nat reversed, i.e.:
nat (cust1,outside) source static obj_10.15.202.0 obj_10.15.202.0 destination static obj_10.15.200.0 obj_10.15.200.0
should be
nat (cust1,outside) source static obj_10.15.200.0 obj_10.15.200.0 destination static obj_10.15.202.0 obj_10.15.202.0
or
nat (outside,cust1) source static obj_10.15.202.0 obj_10.15.202.0 destination static obj_10.15.200.0 obj_10.15.200.0
hth
Herbert