I've made Tikal before, the idea of making her from an Amy is pretty simple, remove the back spines, sculpt the dreads and crown, separate the eyes, swap out Tails' legs, make a dress out of a piece of a T-shirt...well I guess it's simple for me because I've done it at least twice before.
The figures contained in the Custom Showcase are not for sale by Figure Realm, and the creators of the customs are no way affiliated with Figure Realm. The Custom Showcase is purely for entertainment purposes and only provides a means for the creators to show off their work and trade ideas. Figure Realm does not make or sell customs.