No, I wasn't planning to use aluminum bolts, but was using the torque data for such bolts to look at limits for the aluminum case. In any case, here is how it all worked out:
(1) Set up a test fixture and 150 in-lbs would not fully compress the lockwasher.
(2) Manually torqued the bolts to the point where they had fully compressed the lock-washers and left them solidly engaged but no excessively so. Then went and measured to torque - 41 Nm or 30 ft-lbs or 360 in-lbs. Papa Smurf gets the prize!
Just for the record, the 30 mm-long bolts are a perfect fit, engaging all the threaded zone in the case with about 2 mm to spare.
Ralph