I think all of you guys are missing the point with "hook training Burms".
Hook training Burms is not saying they're being carried around with the hook. It simply means it puts an object on the snake first, before just reaching in and grabbing. I've used a roll of paper towels as a "hook" before. As someone else said, they used a bamboo pole...same thing. Anything that lets the snake know it's not being fed and after a while, they associate the "hook" with being removed from their cage.
Hook training, on any large snake, is an absolute must. Anyone who keeps large constrictors and has a common practice of just reaching in and grabbing said snakes...well, they're just asking for an incident.
Beyond that...it's a gorgeous Burm, Gigas. I will somewhat agree with what others have said about "half dwarf burms". He may very well max out at around 6' - 7'...but if it were me, I'd fully anticipate on him being closer to 10'. He may never reach that, but better to go ahead and prepare yourself for it.