BTW -you may place the crystal beneath the 1284p (see the dil40 machine pin socket there are such "windows"), I did it with dil28 narrow socket as well - Unless you plan to change the crystal too often it saves a lot of space. As the heights is concerned it fits nice..
Yeah I was going to suggest parts under the 1284 but I was struggling to think of anything that could go under it - I'd completely forgotten the crystal!