Locke Lane Condominiums

I'm in the early design phase of a project at the old Locke Lane apartments on Grove Avenue. The apartments have been renovated into beautiful, high-end condos, and one of the new owners commissioned a pair of built-in bookcases for his living room. I'm getting to the point where I'm happy with the basic proportions of the case work, but am fussing a lot about details, like whether or not the heads should be arched. Here's where the sketch stands at present.