Raider and Guardian have 120 poise, the others have 40. So a single 25% poise upgrades should raise the lower poise chars to 50, just 1 shy of the important 51 threshold? Is a single 25% upgrade therefore usually useless? And is there any point to increase Raider/Guardian Poise beyond 120?
You are a well skilled survivalist, and getting by is no issue. You start with no tools, but you have stone/bronze/iron-age skills of crafting, as well as knowledge of classical physics and math, and basic chemistry. You have all your memories.
You are alone, and you have a time limit of 50 years. You need sleep, but survival takes no time. You remain healthy and physically strong.
Your goal is to define the base SI units metre, kilogram, second, ampere, kelvin, mole and candela within a margin of error of 5% (or argue what margin you deem reasonable).
Where do you start? How do you proceed? Which tools do you need? How far do you get? How do you handle propagation of errors?