Do you have a ruler big enough to cut the pieces you need in one cut? If you do, lay your ruler over the motif you want to cut. Put Glad Press & Seal over the whole ruler top. Use a fine sharpie and exactly trace the motif on the glad plastic and this creates a template for cutting exact matching sections. Then cut out your sections one at a time. You will get the exact repeats but you would still have to tape the wonky sections to your cutting mat to get straight lines to sew? I don't know if it will work on your wonky panels but do a dry run with one panel and see before cutting anything. As others have said you may need to change your fabric choice.