[kach22i]

The lower edge of the picture I posted qualifies as 3D, but it was accidental or incidental.

Planning a purposeful 3D shape to an exacting shape with any precision will be a challenge, but I suppose it can be done.

It will not be pretty as others have pointed out.

In any case it's best to remember this material has some memory, so you want to over curve as it tends to spread back out while cooling/hardening.

If anyone can suggest a glue or caulk/sealant for the joints I for one would appreciate it.