alot of people use and have alot of success with bedding roll foam.. the cheap stuff u find at any camping store. I've tried it.. but I'm not 100% happy with it and the way it holds onto the scope and holds it's shape.. so I'm gonna when i get some time try out some other materials. As to more mods.. i take it u've super slidered and milk bottled u'r washers? it doesn't look like u'r replaced the standard strap things that are on the alt springs with keyrings? u can make up setting circles? install carry handles? there's tones of mods.. have u checked out the ice mods?
http://www.iceinspace.com.au/index.php?projects
then.. after all that.. electronic focuser and a dsc box..
el