Glad to hear you were not flooded!
Tartan has the right idea. make the border first, then fit the center in. Here's one I did several years ago:
Recycled Shirts
I made the border first, then the center, then cut the white inner border to bridge the gap.
A couple of things. The twister block's edges may not be on straight of grain and will have a bunch of seams, so when you are done piecing the border, use a long stitch length and stay stitch both the inner & outer edges. You will be doing some manipulation so this will help you keep it from stretching. When you sew the inner border (or center of the quilt) to the twister border, you may find it easier to unstitch some of the twister border. carefully remove any stay stitching first.
A design wall is a must!
hope this helps.