Some additional thoughts on the main landing gear:

The wire is too thin to carry the weight so there is a spring strut (just don't remember the correct name) similar to those on old light aircraft like a Cub. It's a thinner wire soldered to the outer ends of the main wire and hold by kind of a block in the middle. I suspect this "block" is a bit springy and makes a suspension for the vertical loads.

In horizontal direction the landing gear is a torsional spring, the actual leg (from fuse to wheel) being a lever arm and the short part across the fuse being the torsion spring. The twin wheels might be added later when this torsional spring turned out being too flexible. When horizontal loads from the ground hit the wheels, the tandem stays level and prevents the landing gear leg from swinging too much. Maybe...

Maybe that's why the brakes are on the rear wheels. It could be magnetic brakes (disk brake actuated by an electric magnet) as offered in several ads in Grid Leaks magazine at the time. They were not uncommon in the sixties (Graupner had them but way too expensive for me).

Seems the toe-in is quite big because it is reduced when the landing gear retreats under load.

The complicated triangle shape is actually a simple solution. Separate landing gear legs with a torsional part across the fuse need a rigid attachment to the fuse. This one-part triangle solution is simply attached to the fuse bottom by clamps. The triangle is the rigid attachment.