Right...

Rough weight check on Bubonic Plague:

Armour/chassis (plus extension, minus flipper) = ~40kg
Motors = 6.2kg
Batteries = 7.2kg
Wheels and gears and stuff = ~10kg
Flipper (including power and mechanics) = ~12.5kg
Disc (including power and mechanics) = ~20kg
Everything else = ~10kg

By my (very bad) calculations, you are overweight by about 6.2kgs.

If anyone wants to step in and clarify/correct me...?