I typically separate my hypertrophy training by muscle group, so I'll have a glute/hamstring intensive day, a hip intensive day, a lat/upper back intensive day, a tricep intensive day, etc. I've been doing this by feel and have been emphasizing whatever I feel needs work, which for me lately has been my triceps, lats, glutes, and hips (emphasized in that order).
So, I'll go in on an extra day for a 45-minute session and do almost exclusively tricep work, which could start with a big pressing movement for a predetermined repeated effort max (dumbbell presses for an eight-rep max or so; Louie told me to shoot for a six- to ten-rep max on exercises such as these) and, as I fatigue, continually lighten the intensity and increase the volume. The progression will end up being something like, dumbbell presses, to JM presses, to tricep extensions, to band tricep pushdowns. Once I get to the more volumnous exercises, I start to incorporate core work, sometimes in a sort of "complex" (i.e. alternating a standing cable ab exercise with a tricep pushdown).
However, over the course of a day, I might do core, upper-, and lower-body training. It's not systematic, but if I do an extra workout with some tricep movements and some core work (I almost always do at least one core exercise), I might do a couple hundred leg curls that morning or that night, or I might throw in some banded hip abductors or some other light, accessory exercise that I oftentimes don't even log because I'm doing them at home. Sometimes I'll rotate in something different (i.e. an external rotation exercise with a glute/ham intensive extra workout) just because I haven't done it in x amount of days. So, it's not programmed in a systematic fashion, but it is at least semi-routinized; I've always had a mind for remembering a great deal about my training even over the span of the last several months, so I can rotate things at a regular basis without having to refer to my log. I can usually tell you roughly when the last time I did such-and-such an exercise was and what, roughly, the set and rep scheme was, even down to the little variations, like a glute-ham raise with two mini-bands and a monster-mini.
I think hypertrophy complexes are a good idea, and they're something I should push myself to program better. I would say that my assistance work is similar to yours in this way, WC. Hypertrophic training was described to me not just as a means to put on weight, but as a way to address and improve one's work capacity. At Westside, it's pretty common for guys to do either a lower-body and core complex or an upper-body and core complex, and that core work will often get done while resting from their other assistance training, it's a way of developing GPP, I guess.
