Sculpted Ground for Cave COver

I need a set of sculpties to create the roof of a cave and the ground of the land above it. It should be just the top, not the bottom as I can do that with my landscaping tools. It should be able to cover alll but a small portion of a 30x30 (Or so) impression on the ground, with the edges of said impression approximately even.

The ground part (The top of the sculpty needs to be the same texture as my land (Go to the center of the Sliderule Sim, I don't have a Landmark available right now, but if you see a large white building you're there) to see the ground texture. It also needs to be generally the same kinda shape as afforded by smooth Linden Landscaping.

The bottom side can be kinda craggy, and should be rock or dirt.

I need it to be 12 prims or less (Should be manageable)

PM me here or IM me inworld if you have any questions, if I'm not in-world Ill recieve via email and reply if I'm at a computer.

I have seen several complete sculptie cave systems on the SLEX. Look under Building Aids>Sculpted Prims