To this point I have added Mato Suspension.
Sprockets, Idlers, Swing Arms and Roadwheels, no Ball Bearings at All, and Metal Track.

So far I'm pretty Unimpressed:

The replacement Axel Screws (Mato) that connect the Swing Arms to the Hull are Very Soft (White Metal).
So Care is needed, so as not to strip out the Phillips Head or the Threads.
Also, those Axle Screws seem a touch Long, allowing a little Wiggle (slop) in the Swing Arms.
Think this may cause problems down the road in retaining the Coil Springs, that use Friction and Allignment to keep them in place.

Next the Hexhead Axel Screws that came with the Mato Roadwheels require a different size Hex Wrench.
Apparently I'm missing this size in Inches or metric, so I reused the Original Axel Screws.
The fit is pretty Fair.

The Mato Sprockets went on easy and Fit Well.
Very Little Slop.

The Idler Wheels were a bit difficult to install.
The screw pitch is different requiring a firm hand to get the screw all the way in.
once mounted they retained quite a bit of Slop (Wiggle).

The Mato Tracks look quite nice.
Laying them out next to the Original Plastic Tracks, they seemed One Track Block too Long.
So I removed one Block from each track and installed them.
After Proper installation they Seemed Very Tight, no Sag at all from the Idler Wheels to the Sprocket.
So I added the deleted Track Blocks back, one to each side.
Now they seem Extra Saggy.

I did a test run and wound up throwing a track, port side, running on short carpet...
During a Spin... No real surprise there, but it won't do.

I'll get a Photo up this afternoon...

-gus