The Origami Forum

I didn't think this would be too difficult for a first attempt at making something harder than cubes, but having made my 12 units I can't see at all how to assemble them, and the diagram (https://www.google.co.uk/url?sa=t&sourc ... YSvjPwGDKA (step 16) isn't all that detailed. If someone could please explain to me/show me how to assemble the units I would be very grateful, as it's getting frustrating now!

Thanks
Cat