Yah know, that female twi'lik wouldn't be that difficult to make. Don't paint the black tatoos directly on the figure. Instead make decals in photoshop and apply them just like you were decaling a model car.
I've got to agree with Jesse and add that I personally don't think its worth selling customs on ebay. The amount of money I've received in the past just doesn't justify the work and hassle of ebay to me. Besides, the only thing that seems to sell well there is clones and I'm not going to make a clone just to cash in. I don't need the little bit of money I'd make from the sale of customs to make it worth it.
I would however love to have at least one custom made by each person that posts here. I've collected a number of customs over the years made by online friends that I admire their work. I think I would rather offer up some customs here to people at a cheap price (say $5) to free up shelf space for future customs.
Actually, I'm very surprised on how well this figure stays together. All the joints are tight and move very well. These figures are much higher quality and stronger plastic than anything hasbro produces. Sad part is they cost the same as a regular hasbro star wars figure.
I think of these as the same as using a Dragon body for 12" doll. Findswoman could make a fantastic softgoods outfit for these bodies.