I wanted to create a few xls gm helping tables. I wanted to ask around if somebody still has some material around or knows where some sheets are available. For example I created a sheet that calculates armor / layers of armor and the calculated quickness reductions.

There are some tables in the NSRCG3 installation, i guess you have taken a look at these already?

Yes there are, I meant some helpers, to quickly calculate ramming damage by the speeds / distance of the cards, automatic conversions, calculation of the "layered armor" and similar.

- The ramming xls and armor layer xls I have finished

Ah, automation, not information, gotcha.
Nope, no idea, sorry ._.

And i'd try to do this sort of thing in HTML/JavaScript/CSS maybe, because you're probably going to encounter more people with a program that can work with these than you will encounter people with an office application that can execute the .xls files.