I have a pair of those monodex shears, the blade breaks when you chuck them in the draw of your toolbox;-) I used to cut out body sections with a pair.
The solasun sunroof company had a race between two teams of installers at santa pod, race installing a sunroof that is. Two blokes with monodex cutters cut the hole and other assorted blokes stuffed the roof in and screwed it in[no cordless tools]. They installed a sunroof in under a minute!