I don't know Bowers' full method, but I do know Brassard's. (I actually read the full operation report for what he did to me! It was pretty cool.) He uses penile inversion with scrotal skin to augment the vaginal canal as needed, scrotal skin to create the labia majora, and scrotal skin on the "outside" of the labia minora plus urethral mucosa to line the inner side, with the mucosa wrapping up to create the inner portion of the clitoral hood. The effect of that is that the labia minora and clitoral hood are a) light pink and b) mucosal, exactly as in cis women; one pleasant side effect is some degree of self-lubrication, varying by patient (I get enough to be moist but not to need a pad or to be adequate for sex, but I also get some internal lubrication *somehow* [??] that is enough to get by). The only external scars are about 3" in the center of each of the labia majora, from which I infer that he must stitch them together at that point, and at the base of the vagina where everything is connected. I gather there are also internal scars where the scrotal skin grafts are joined. Lastly, he also removes a 1" square of the perineum where the vagina will be located, and preserves that skin to use for additional vaginal grafting.
The overall effect, to me, is *very* natural - he deliberately places the hair-bearing scrotal skin in places where a cis woman would have hair (outer side of the labia majora) and urethral lining in places where a cis woman has moist pink mucosal tissue. Personally, since I know the scrotum is made from the same structures that create labia in the fetus depending on hormone bath in utero, I'm pleased to have it rearranged to where it should have been. 😉