Hi Gary,
I am very interested in how you mounted the belts inside,since I want to do something similar (
http://www.iceinspace.com.au/forum/a...se.php?a=67161)
Could you post some pics or drawings?
The PE curve looks quite OK to me, those small sudden jumps (47 of them per period) were exactly what bothered me as well.
The rest is probably easy to remove with autoguider.