Here is a quick screenshot I took this morning just for some eye candy. Please to enjoy.
On my system sketching and extrusions are working quite nicely. I am sure that there are profiles out there that will take it down, but even moderately complex ones are working for me as of now.
As a quick aside, since I am working away on all of the geometric intersection routines I needed a good way to quickly generate solids to intersect. I can use any one of the existing planes and create two solids that intersect pretty easily, but I wanted a bit more. So I have started to work on a dialog box that will allow for creation of arbitrary planes. This is something that will absolutely be needed down the road so I figured why not now. I have also mocked up the dialog box for pads (extrusions). Here that one is: