So the bottom line math according to batt size is 90 - 6 (border) + 4 (quilting take-up) x 2 for both sides = 70 for width and 108 - 6 (border) + 4 (quilting take-up) x 2 for both sides = 88 length
I could trim the sides which would be a waste of expensive fabric or make another long string of strips and add them strip by strip until I get the right length, or just forego the fun of halving the joined bunches of strips and add 70" strips one by one until I get to the 88" length, then add 6" borders.
The fabrics for the borders and any extra I need are being re-printed and not available til August, so I'm looking at a short term UFO here....