How do you cut Stratco Outback roofing?

Hi - I am putting up a Stratco Outback Patio Cover on our new house and have been coping with the problems as they come.
　
Stratco asked us to take a final measurement after the place was built so they did not go off the plans to pre-cut the parts.
　
We gave them the final measurements that differed greatly to the plan measurements and they were supposed to cut all pieces to size - They didn't
　
I found it easy to cut the support beams but I am having heaps of problems cutting the roofing. The ridges are way too difficult to get snips around.

http://www.bfm.net.au/images/stratco.jpg
　
Has anyone come across having to cut these sheets?
　
Is there a trick to doing it?
　
I was wondering about trying to get a really thin cutting disk for my grinder - Would this work?
　
Any advice would be great please.
　
Paul


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