Thanks again for the contributions. To keep the thread updated, I found Losyco GmbH which can install precision rails. However, we're not going down that route anymore.
I'm looking to find a precision linear rail system roughly 20-meter long to install onto a factory floor. Toleranced at the micron level. This rail will be used for locating assembly tooling and components, so it must be installed accurately.
I'm sure this exists but I'm struggling to find the...