It's a Japanese book/magazine called Sensational Model & Hobby. From memory, I feel like these were Botcon creative works (and Autobot X would definitely suggest that too) but I couldn't remember if (like Magnus, Superion, Predaking, Bruticus, Metroplex, Perceptor, Galvatron, Slicer, Omega Spreem, Double Punch) we'd ever seen evidence that they were planned as Action Masters/recolours.
And, after some detective work, it does indeed look like they were entries in the Botcon 96 Art comp (maybe by 'Weeter') - they're not in these pics, but the toys behind and 'under' them are.