I’d suggest you take a closer look at Genuine_S posts,
as well as to his blog and flickr account 
So far, he seems to be the expert for lightweight mods here.
I’m also planning a very light Strida, but more as a long term project.
Already collected were super light tyres - many thanks to Genuine_S 
and a bunch of Titanium parts but I’m still searching for a cheap frame.