Spreadsheet is now a reasonably user-friendly item, and seems to churn out sensible numbers. There's still something a bit off, particularly with the ride height/spring length calculation in all the spring rates, but I don't think it's miles off producing accurate results. Spring rate and ARB calculations seem decent anyhow, and the ride height has a fairly minor influence on the roll rate...
https://docs.google.com/spreadsheets...it?usp=sharing
The 'Damping' sheet is still very much a work in progress - I need a lot stronger maths before that's any use at all! Imaginary numbers give me the heebie-jeebies though, so don't expect any progress any time soon!
If there's anything that anyone particularly wants to see in there, let me know and I might be able to add it in...