How hard would it be to modify my Noah 12 tarp to shorten the sides and make it easier to put it into storm mode? Has anyone does this with larger tarps? If so please let me know. If I need to just follow the normal tarp making guidelines then I'll do that. I'm just worried about messing up the rolled seams and the attachment points. If I do this I want to be sure I get the cuts correct and it works correctly. I know I can sew it right. I have enough confidence in my sewing now to do this if I need to. It's just the cutting that worries me.