I know if it were my bike I'd try to bring her back to 100% original, the correct saddle and water bottle aren't easy to find, but they are out there.

In general, the average Lotus bike may not be as common as some makes, but they aren't particularly rare. However, completely (100%) original Lotus bikes, any models, are EXTREMELY rare.

You're most of the way there with this bike and it has a lot of winning attributes . . . condition, color, size, and model. I'd make it a museum quality display bike and you may end up with the only one out there left of it's kind.