Similar exercise with my 2 reavers, I primarily used 3x1mm magnets and a couple of 5x1mm magnets and 3mm steel balls. Quite pleased with the result but this can still be improved.
A couple of observations:
Legs - torso joint: I used a 3x1mm magnet as it perfectly fits into the round hole situated at the "pelvis". I drilled a 3mm diameter hole into the torso and I glued there a 3mm steel ball. Adherence is ok-ish but another magnet would have been better (either a stronger one or using 2 magnets instead of one and a steel ball). If my reaver shakes its booty the legs will fall apart I am considering adding a couple of 1x1mm magnets on the "ring" to reinforce adherence, not sure I will. An alternative would be to use a metallic rod (beware of its length as the pelvis is hollow and you don't want to push the cables out). There is some room into the torso (requiring some drilling), much less into the pelvis.
Head - torso: I drilled a 3mm hole in the torso to insert a 3x1mm magnet. Easier if you do that before actually assembling the torso. You can then also glue some plasticard or sprue part behind the magnet to better maintain it into position (I encountered no problem but it would be tricky to retrieve the magnet from the inside of the torso if you push it too deep into it). I then drilled a 3mm hole into the head, roughly aligned to the one in the torso. I inserted there a 3mm steel ball. Adherence is fine. As the back of the head is hollow I initially tried putting the steel ball into the cavity but resulting adherence was zero, hence I switched to direct contact between the magnet and the steel ball. Another magnet would do the trick as well, probably giving less flexibility in the positioning of the head.
Carapace weapon: by far the easiest, insert a 5x1mm magnet into the carapace. You can do the same into the missile launcher. I opted instead for a 3mm steel ball, it requires a little bit of drilling but saves me a magnet (and as the weapon comes above the carapace there is absolutely no downside doing it, not quite the same for the arms …).
Torso weapon points: quite easy as well, 3x1mm magnets and some drilling. Drilling through would allow to add 1x1mm magnets to the armor plates coming on top of the "shoulders" and have direct contact between the magnets (maybe I'll do that).
"Arms": the lower part ("elbow") is quite easy, remove the little plastic pin and drill a hole for your magnet, here again I used 3x1mm magnets. The upper part, with the ball, is trickier. Best to mark the point where you want to drill and be sure you are drilling vertically (with the lower part flat on your desk). If not, you'll end up with a potentially awkward positioning of the arm. I tried with a 3mm steel ball but this is only ok-ish for the lighter (in weight) weapons, otherwise too much weight and your weapon will point towards the ground. Hence I reverted to my use of 3x1mm magnets.
Weapons: again 3x1mm magnets and some drilling. The weapons, some of them, are hollow, beware of not pushing the magnet too deep.
A general remark: drilling and sometimes gluing magnets in place can be easier before the various parts are fully assembled. Dry fit to ensure it is ok.
Very important is to make sure your magnets are attracted one toward the other and not repelled. My choice is to have the ones in the torso attract all the other other ones. I then use a magnetized arm and a magnetized weapon from my knights to position them correctly. To position one magnet into the torso, I grab it with the knight's magnetized weapon. To position it into the weapon, I grab it with the knight's magnetized arm.
I haven't tried magnetizing the fists yet.
On another note, I received my warhounds yesterday and have started building them, already putting magnets as well. They are absolutely cute. And quite bigger and larger than the warped warhound I attempted while waiting for AT to be released. I'll see how I can adapt this.
Edited by Mendi Warrior, 18 October 2018 - 02:14 PM.