What an interesting design!
I think I would draw my own clamshell templates, piece them, then turn the edges under with an iron and starch and applique them to a wholecloth top, with similar embroidery motifs.
Then I'd do some really spectacular quilting on all that white space. What a canvas for quilting designs! Woohoo!
Laying out the design on the quilt top would be the most challenging part for me - trying to get everything centered and perfectly spaced. A t-square and a yardstick compass could come in handy on a job like this.