Yes. This understanding is correct however, it is prohibited to put sharp objects, metals, materials that contain a lot of liquid, magnets and electronic circuit in the shuttle cock and the outside material should be natural or synthetic fiber.
The information regarding colors and materials has been released by robocon Vietnam in the ‘appendix’.
As far as local paint codes are concerned, currently they are to be visually matched.
It is given that weight of (rack+manual+automatical) <=50 kg.. Is the weight of rack considering weight of shuttlecock? Also, is it that (manual+rack<=25 kg) and automatic <=25 kg (total =50 kg) ….. Or as previously said (automatical+manual+rack<=50 kg)
Sorry for the late reply considering that robocon 2018 has concluded.
In the rulebooks nothing is ever mentioned regarding any tolerance about robot weight and size. But in India, it majorly depends on the weight and measurements official. So, if you are lucky they might just overlook any minor exceeding. However, this could be only for a match and hence it’s best to be in limits right from the start and plan and design your robot accordingly.