If you do not have the DXF importer, I can save it as a pattern. You just won't be able to tweek it other than size. If you use Corel or other vector programs, the dxf is pretty important to have.

I use a shim, too, for every job that should have an original top surface., but it is a business card:
I have used a biz card to raise the starting point. You may notice in softer woods that the bit actually dents the surface. This dent is now the surface as far as the software is concerned.

When the machine goes to finding surface, you can hit stop to jog to touch surface. I open the lid and place a business card where I will jog to. Then remove it before the carve starts.

Caution! If you hit stop twice in a row it will cancel your project!!