The overall mechanism was taken from my F2000, however this has a working mechanical trigger (rather than the rather disappointing and botched string trigger than put so many off building it) and the location of the bolt in this design is much more practical and ergonomic than the F2000. There is also a sophisticated mag release lever which can be operated without taking a finger off the trigger, as indicated in the slideshow.
To summarise, it is lighter, easier to handle, is easier to use, and is more accurate than my F2000. It also has a trigger.
Yet again, some credit to Ironman69 for the mag pusher idea.