10 Interlocking triangles

[Teg]

I have been trying to make the model on the following page:

http://www.langorigami.com/science/poly ... part_1.pdf

So far I have managed 2 of the 10 required but am finding the part where you put the modules together incredibly difficult (on page 23) and was wondering if anyone had any handy hints?

Thanks,

Teg