How can I remove the seat fabric off the e3?

It can be removed as follows:

1) Remove bumper bar
2) Undo domes at top of sun-hood
3) Flip sun-hood down towards foot-rest
4) Unhook/remove sun-hood from buggy frame
5) Undo domes at top of sling
6) Remove handle (depress nib springs/metal buttons)
7) Unscrew/un-dome anti-fly straps from buggy frame
8) Partially collapse buggy & un-hook sling from bottom area of frame
9) Slip sling off frame