Hi delic, it's looking good! re: tangency - usually the easiest way to make things tangent is to construct smooth areas all out of one single larger extended surface and then cut away excess portions of that to form the final borders, rather than trying to sort of fill in pieces on a "patch by patch" basis.

- Michael

Thx Michael and Lawrence.

I begin to feel comfortable with MoI, it's really handy, and intuitive, I like it.