So, following the instructions, I had glued the hip ball joints, and departing from the instructions, after some posing of the legs, I glued the hip piston rings in the position I wanted, biggest lug downwards. By gluing the ring, it will add stability and strength to the hip joint and the legs with ten extra points of contact with the legs and the hips in the form of the pistons.
But the titan is so huge, I thought I should make the construction detachable at the waist. I knew from painful experience (Reaver toppled and fell) that trusting gravity was a fools errant, so I bought super powerful magnets 25mm x 10mm with the pulling power of about a small elephant - seriously, I left them near eachother and they flew together chipping one and needing all my strength in my fingers to pull apart without leverage... that will do nicely.
Before placing the magbet in the recess I applied glue and then held together by the magnets, I applied JB Weld around the top magnet, sealing it in place on the Base Plate.