I've had a few lotus frames come my way. The first one was a Lotus Excelle:
chromo 2001 ? tubing. Pretty light. I forget what happened to it, but I'm thinking I sold it on ebay...
the latest lotus is a full on touring frame that should be here later this week, Lotus Eclair:
here's a pic of one built up I found on the net:
same tubing.
I've also seen a few other Lotus in person and they all seem like nicely made Japanese machines. There doesnt seem to be a lot of info about them out there though.