[Jim727]

Mike -

What about custom shear-head bolts? Picture a bolt with 5 stacked shear heads, each of which is calibrated to shear off at each of your specified torque values. Smallest head on top (for the 200 ft/lb) progressing to the largest which shears at the 900 ft/lb value.

Because each head is slightly larger than the one above it, you should have no problem getting the wrong torque value, it would be immediately obvious if any bolt had not yet been torqued, everything is pre-calibrated, and it's relatively simple.

Only downsides I see are (a) bolts would probably be custom and therefore spendy - but probably irrelevant compared to the overall container cost; and (b) the driver would have to change out sockets for each torquing round.

Interesting project!
Jim