I am 2 meters (6 feet?) tall and I fit. (mostly of the time It's a bit cramped and remember: no pain: no gain . Now serious, I am making a new dashboard with more space for my legs. So I can sit more comfortable. This dashboard looks like the original and is made of glass fibre. I made a mould in case if somebody wants a copy. (I haven't installed it yet, I postponed that for the winter period).
Now about your weight: If your weight is around your belly; there is no problem. Do you look like Schwartzenegger: You won't fit, period.
The asw15 is very easy to (de)rig. Als handling is very easy, some german clubs use it as a trainer. From friends I heard that the libelle is a bit nervous to fly. But hey, you're asking a asw15 owner