Those are some pretty nice kits! I like how you used the magnets for the base. How steady is it when fully extended?
Pretty good actually. The base foot is quite big, 20x12 cms and being made of 10mm MDF relatively heavy. It is really stable, even when extended to its maximum height of about 50cms. Even the big Blackhawk stands nice and stable. And because the magnet is placed at the balance point of the model gravity cooperates as well.
There is a tradeoff of course. The foot is too big to place so I won't be able to place it everywhere on the table during a game. But I felt that was worth it.