Structural Problems in Foundationalism

At the outset of Chapter 2, Elgin argues that foundationalism is not problematic because the standards for justifications are too stringent but is instead problematic due to structural problems. In Chapter 2, however, Elgin mostly describes how foundationalism requires a tedious chain of strict justification derived from other "peices" of justified knowledge (as though chain-links in a fence). Finally, at the end of Chapter 2 (59), Elgin again criticizes foundationalism for excluding forms of knowledge such as metaphor (and even mathematics!). If possible, can be spend some class time going over Elgin's arguments regarding the structural inadequacies of foundationalism and matching up her arguments with what she says she is going to do at the outset of chapter 2? I think I might have misinterpreted some of her points.