Large seam allowances are an awesome idea! And yes, good point about clipping seam allowances around the neck and armholes to release them to the seam line.

Also I always add about an extra inch to all side seams in the mock up and in the final fabric because fabrics types can give or not in so many unexpected ways. I can trim at the end if needed or it allows for future alterations. I never get smaller darn it.

Finally I always clip the round curves on the mock up the usual half or 5/8 inch of a seam allowance, like at the high neck or the arm hole so that I can see if it gives the right amount of room for movement and that the seam hits where it should.