Glad I caught this thread, some great content
Im either late go the party or early, either way just a couple small add ons for future use. Down South here we have two similar issues you touched on that perhaps I can add some pointers to.
Large photos can be achieved (specifically I did this to several Sativas) , for long veg on short days very easily, start them on an 18 hour cycle for 3 to 4 weeks, midnight to 6pm, then swap to a split between indoor setup and hardening in afternoons, effectively taking a bookended daylight spread of late winter/ early spring of 10 to 12 hours and stretching to 18 hours with half the time under lights. So to describe this the cycle begins under lights around midnight and goes through to around 8am, whereby they take a sheltered structure (glasshouse, sunroom, grow tent) time for enough natural daylight without the extreme weather ends, usually on a bale of straw to hold it up to the best light and insulate the bottoms from temp loss.. It worked super well, the old lights and ballasts used too run super warm, venting and heat exchange was always a breeze pardon the pun. Once frost free (late Sept early October) Switch to bookending at the latter part of the day, you can creep your times in if you worried but I found they barely showed any troubles on a 4 plant grow, and keeps daylight a grow space times to one then the other instead of lights, sun, lights in the 18 hours.
Once your daylight hours (and plants exposure to all of them) is at 13 hours or better they can fend for themselves(flowering sensitivity may vary of course). Effectively the days grow longer and hotter on average and by this stage you have a solid sexed plant thats nice and hardened and should have few fundamental issues in structure that have not been attended to or influenced.
These plants can then run pretty deep past summer before flowering. I did prompt finishing in some of these by shedding (literally putting them in a shed devoid of light at night ) bookending daylight hours shorter in the morning, and pulling out mid morning. As habitual as they are they still can be influenced to do as you want them to do, its just a choice to be the ultimate master of them, while slaving their needs.
The other was heat measures, but Ive rabbited on enough so I drop back later and see what i can add.
subbed in cuz me luv touring thru Oz...um, virtually at least, hehe :smoking: 
ppp
