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Some more pics, 1st ride:
Painted with Tamiya PS5, some decals are original tve others are plotted:

Made good experience with Dowanol PM to "rescue" the old original body. A small amount on an old cloth and overnight in a plastic bag. Then just peel it off. The decals survived bit I already plotted a sheet of new and will replace the worn-out ones.

Found some hours to complete
First drive:

Measured a bunch of my 540 class “silvercan” motors to see which one performs best in case of efficiency, wattage, revolutions under load... not all of them are brandnew, but the data helps me to select for some vintage-projekts so I just want to share this, perhaps somebody is interested.. Similar ...

Hi, i ve a similar one, thought it would be the 1708 Trinity, bit with green sticker.. measured data seems to be 17x3 Turns..
Perhaps you can open it and take a pic?

Some work to do..

After destroying several UM-1, I searched for a substitute and (hopefully) found it in parts from a 3D plotter store (for just a few cents)... pictures:

Works smooth and quiet:

Thanks! The motor direction remains "counter clock" due to the obsolete middle gear..
testchassis:

Belt module is GT2 (or 2GT, means 2mm per tooth). Calculated length 142mm (71tooth). Pinion
16tooth and maingear 50tooth (better take 48: only very small gap to the outdrives left). Smaller
pinion should be no problem, respectively with a slightly shorter belt.

Some armatures I did years ago for some straightaway and racing. Soldered with hightemperature lead (300°C+). Balanced statically via razorblades, dynamical with a structure made from piano wire, bearings and a hand drill. Afterwards epoxied the winding and armed/trued the comm. To maximize the copp...

For comparism: rewound and soldered an old (burned) Tamiya Technigold (same wirediameter (.80)
and also 21 turns) and measured it with my two others: about 1.5K more revolutions under load and
slightly more max. output.

Built the Saurus chassis from (almost) new parts. Some Platinum's for the rear fit perfect, for the front even the short ones seem too long for reduced ground clearance. Took some alloy dampers with modified pistons / Tamiya red silicon o rings and placed it in a position I found on the Kyosho boxar...

Rebuilt these (leaking) shox as well.. the red Tamiya silicon o-rings work perfect as substitute. Try 27,5wt oil in front and rear.

Car got a brushless update (11,5T), beltdrive takes it well, not the tires..