My frame is 56cm. The cranks are stock, not exactly sure of the length and the bike is at the train station right now, so I can't look/measure. It is a 2004 version though, so you might be able to find it out there somewhere.

I like the Bug alot. I carry a laptop everyday and I just put it in a padded laptop sleeve that came from an old travel briefcase before sticking it in the Bug. No wear and tear issues on the laptop that I can tell. I do a bike-train-bike multimodal commute, so I appreciate and use the backpack conversion feature of the Bug everyday. Give the folks at Arkel a call. They will ask you about your needs and talk you through their products that will work best for you. I have had nothing but great experience with their products and customer service.