full defensive in mids : active shield hardeners ( 2em 1ther 1 kine)+invul
DC in low +bulkhead
2 T2 drone mining rigs and one T1.
highs have mining yeild boost + shield resist boost + shield buffer boost.
Then one remote shield booster if you are with a friend, and auto targeting module to have more asteroids targeted.
Remember you can OL the RR shield to heal 140 hp/s, with adequate fit on an mack this can be 700 ehp/s - so basically can negate a catalyst. Plus if you have more RR mods this can be very helpful (but you need to swap the bulkhedad for a coproc )
That makes a 350k ehp orca cold, with a large ancillary remote shield booster to help rep a friend if gankers land .