This German built paragliding sim is a permanently installed aluminum-framed unit. It appears to be quite robust and provides weight-shift input, although not very portable.
This unit was developed through the efforts of the BHPA (British Hang Gliding Association) and Hull University, so there were some very smart people involved (and a lot of funding!) I really like the frame design for this unit.
Some great models for VSF are provided here by Jason Simpson. (One of his models is featured on the front page.) Fantastic models for sure!