Here it is without color......and with approximate colors:
The panel has the advantage of many of the sides already being hemmed and the sequins already tacked down.
The panel is ~ 4' x 7'
Couldn't for the life of me find the pattern that I was thinking of as I thought about cutting up the panel. So I grabbed out some extra material and made a mini-model, mostly just to figure out the logistics. Made 3 slits all the way up to the bodice, straight up. The took a second type of fabric and made three large triangles that matched the size of the slits on two sides. Fit them to the sides of the slits and sewed a straight line.
So not entirely difficult. The question now is how to get the tentacles into the mix. Or if that's wanting just too many things...