I have a diagonal corner cabinet (the upper cabinet which is above a lazy susan lower cabinet) that is stalling my crown molding job. It's very intimidating for someone with minimal woodworking experience!

Adding to the problem are two things

1) the compound miter saw I am using only bevels in one direction.

and

2)It's a small saw and the dentil crown is too wide to place it resting on the fence and the table, so I'm going to have to cut it flat.

So, anyone have any hints for cutting this crown while it's laying flat? I figured out the two 45 degree angles, but this corner cabinet (135 degrees if I remember right) is tripping me up.

Any help would be appreciated!