Lay a thread base along pretty much the full length of the body on the 2x long hook, then bring the thread back up to the front.
Catch the first strip of 2mm foam (tan, the middle layer) in at the front and wrap it down tight against the shank all the way back to the bend. This layer is there to keep the body even, not for flotation, so wrap it tight.
Take the thread back toward the front and tie the second (coloured) strip of 2mm foam in just a little in front of the rear tie-down. Fold it up over itself and lock it with two or three wraps, lift it, take a couple of wraps underneath, and repeat forward until you have about four segments up to the midpoint. Keep these wraps light so you are not matting down the foam that does the floating.
At the midpoint fold the coloured foam over and secure it with a couple of wraps. That is the back half of the body; the flap left off the front becomes the head. Take the thread under the fly and back up to advance it.
Tie in a short length of White synthetic as the indicator, catching it in at its middle with two wraps, then fold it back and trim it to about the back of the body.
Knot two strands of Barred silly legs together and trim so one strand comes off the back and two off the front. Tie a set in on each side with two wraps, with the knot sitting about at the back of the fly. Trim the front strands to just in front of the eye and the rear strands to length; do not worry if they flare.
Lay the top piece of coloured foam over the fly, sandwiching the White synthetic indicator between the two foam layers, and secure it with a couple of tight wraps. Before cinching fully, check the legs have not been pulled out of position.
Take the thread underneath and back up, then catch in a second pair of knotted Barred silly legs, one on each side, with the same two wraps. They flare out as you pull tight, which is what you want.
Trim all the legs to size, front ones slightly shorter than the back ones.
Touch a drop of super glue to the thread close to the hook, wrap two or three turns until you are no longer wrapping glue, then whip finish right between the two front legs (by hand if your whip finish tool will not fit) and snip the thread. Shorten any legs that are still long.