I struggled much more than I thought on aligning the source coordinate frame to the T1 image. This was because the T1 image was moved from head-first supine to RAS in addition to its normal affine and the source estimate was already in RAS. This coordinate frame wrangling took longer than I had anticipated which meant the tests will be delayed until this week. I also need to fix the volume rendering. Now that the coordinate frame is solved, the basic deliverable GUI is functional! Although, I would like to clean things up a bit more, I'd consider this a successful GSoC (pending writing the tests, which shouldn't take too long).