It's pretty simple Keith. Use a fine-meshed net (plankton net) and tow it very shallow (upper metre or so) for a very short period of time (5-10 minutes) over depths > 400 metres, in either the austral summer or winter, at one of two locations, and keep on doing it until my hands are raw from hauling nets in.
When I catch the little fellow I'll plonk it into an acrylic cylinder aboard the boat, feed it mysid shrimp that have been cultured for this purpose, talk to it nicely for 170 days .... and presto, moderate-sized giant squid.
If only it were this easy, but that's the nuts and bolts of it. All I need is the time, energy and finances to do it all over again. Time and energy are two big ones!