I have created a part which I was planning on mirroring from the start. I though I was careful in creating tangent geometries so that when I mirror the part I don't get split lines. In the image you can see the split lines where it is non-tangent. I had to do some solid clean-up based on the surfacing creating some wierd effects at the split when I thickened the part.
Can someone with some experience inspect the part and give suggestion on how I might ensure I have tangents at the split?
As side note, would you have used surfaces to create this part? Seemed simpler from my limited experience, but maybe that's where I went wrong. Thanks for the feedback!