How heavy a Raleigh 20 frame is? Is it like a ton of bricks, or comparable with say a Dahon 7 (which seems quite sturdily built)?

I can get one for about £10, and the thought has crossed my mind to build it up into a second folder (replacing everything, probably except the stem, handlebars and frame).

Also, does it take a standard Shimano BB? I'm guessing being British, it would. But you never know...